diff --git a/src/Bundle/ChillPersonBundle/Export/Export/StatAccompanyingCourseDuration.php b/src/Bundle/ChillPersonBundle/Export/Export/StatAccompanyingCourseDuration.php
index 9a9319c20..1241c7f88 100644
--- a/src/Bundle/ChillPersonBundle/Export/Export/StatAccompanyingCourseDuration.php
+++ b/src/Bundle/ChillPersonBundle/Export/Export/StatAccompanyingCourseDuration.php
@@ -11,29 +11,46 @@ declare(strict_types=1);
 
 namespace Chill\PersonBundle\Export\Export;
 
-use Chill\MainBundle\Export\ExportElementValidatedInterface;
+use Chill\MainBundle\Export\ExportInterface;
+use Chill\MainBundle\Export\FormatterInterface;
 use Chill\MainBundle\Export\GroupedExportInterface;
-use Chill\MainBundle\Export\ListInterface;
+use Chill\MainBundle\Form\Type\ChillDateType;
+use Chill\PersonBundle\Repository\AccompanyingPeriodRepository;
 use Chill\PersonBundle\Security\Authorization\AccompanyingPeriodVoter;
+use Doctrine\ORM\Query;
+use Doctrine\ORM\QueryBuilder;
 use Symfony\Component\Form\FormBuilderInterface;
 use Symfony\Component\Security\Core\Role\Role;
-use Symfony\Component\Validator\Context\ExecutionContextInterface;
 
-class StatAccompanyingCourseDuration implements ListInterface, ExportElementValidatedInterface, GroupedExportInterface
+class StatAccompanyingCourseDuration implements ExportInterface, GroupedExportInterface
 {
 
+    private AccompanyingPeriodRepository $periodRepository;
+
     /**
-     * @inheritDoc
+     * @param AccompanyingPeriodRepository $periodRepository
      */
-    public function buildForm(FormBuilderInterface $builder)
-    {
-        // TODO: Implement buildForm() method.
+    public function __construct(
+        AccompanyingPeriodRepository $periodRepository
+    ) {
+        $this->periodRepository = $periodRepository;
     }
 
     /**
      * @inheritDoc
      */
-    public function getTitle()
+    public function buildForm(FormBuilderInterface $builder): void
+    {
+        $builder->add('closingdate', ChillDateType::class, [
+            'label' => 'Closingdate to apply',
+            'data' => new \DateTime('now'),
+        ]);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getTitle(): string
     {
         return 'Accompanying courses duration';
     }
@@ -41,15 +58,15 @@ class StatAccompanyingCourseDuration implements ListInterface, ExportElementVali
     /**
      * @inheritDoc
      */
-    public function getAllowedFormattersTypes()
+    public function getAllowedFormattersTypes(): array
     {
-        // TODO: Implement getAllowedFormattersTypes() method.
+        return [FormatterInterface::TYPE_TABULAR];
     }
 
     /**
      * @inheritDoc
      */
-    public function getDescription()
+    public function getDescription(): string
     {
         return 'Create an average of accompanying courses duration according to various filters';
     }
@@ -59,39 +76,67 @@ class StatAccompanyingCourseDuration implements ListInterface, ExportElementVali
      */
     public function getLabels($key, array $values, $data)
     {
-        // TODO: Implement getLabels() method.
+        if ('export_result' !== $key) {
+            throw new LogicException("the key {$key} is not used by this export");
+        }
+
+        $labels = array_combine($values, $values);
+        $labels['_header'] = $this->getTitle();
+
+        return static function ($value) use ($labels) {
+            return $labels[$value];
+        };
     }
 
     /**
      * @inheritDoc
      */
-    public function getQueryKeys($data)
+    public function getQueryKeys($data): array
     {
-        // TODO: Implement getQueryKeys() method.
+        return ['export_result'];
     }
 
     /**
      * @inheritDoc
      */
-    public function getResult($query, $data)
+    public function getResult($qb, $data)
     {
-        // TODO: Implement getResult() method.
+        return $qb->getQuery()->getResult(Query::HYDRATE_SCALAR);
     }
 
     /**
      * @inheritDoc
      */
-    public function getType()
+    public function getType(): string
     {
-        // TODO: Implement getType() method.
+        return 'accompanying_course';
     }
 
     /**
      * @inheritDoc
      */
-    public function initiateQuery(array $requiredModifiers, array $acl, array $data = [])
+    public function initiateQuery(array $requiredModifiers, array $acl, array $data = []): QueryBuilder
     {
-        // TODO: Implement initiateQuery() method.
+        $qb = $this->periodRepository->createQueryBuilder('acp');
+        $expr = $qb->expr();
+
+        $force_closingdate = $data['closingdate']; // parameter from buildForm
+
+        $qb
+            ->select('AVG(
+                ( CASE
+                    WHEN acp.closingDate IS NOT NULL
+                    THEN acp.closingDate
+                    ELSE :force_closingDate
+                END ) - acp.openingDate 
+            ) AS export_result')
+            ->where($expr->neq(
+                'acp.step', $expr->literal('DRAFT')
+            ))
+            ->setParameter('force_closingDate', $force_closingdate)
+        ;
+
+        return $qb;
     }
 
     /**
@@ -105,14 +150,9 @@ class StatAccompanyingCourseDuration implements ListInterface, ExportElementVali
     /**
      * @inheritDoc
      */
-    public function supportsModifiers()
+    public function supportsModifiers(): array
     {
-        // TODO: Implement supportsModifiers() method.
-    }
-
-    public function validateForm($data, ExecutionContextInterface $context)
-    {
-        // TODO: Implement validateForm() method.
+        return [];
     }
 
     public function getGroup(): string
diff --git a/src/Bundle/ChillPersonBundle/config/services/exports.yaml b/src/Bundle/ChillPersonBundle/config/services/exports.yaml
index 4b1db59a0..19ed9174b 100644
--- a/src/Bundle/ChillPersonBundle/config/services/exports.yaml
+++ b/src/Bundle/ChillPersonBundle/config/services/exports.yaml
@@ -33,11 +33,12 @@ services:
       tags:
         - { name: chill.export, alias: count_accompanying_course }
 
-    chill.person.export.sum_accompanying_course_duration:
+    chill.person.export.avg_accompanying_course_duration:
       class: Chill\PersonBundle\Export\Export\StatAccompanyingCourseDuration
       arguments:
+        - '@Chill\PersonBundle\Repository\AccompanyingPeriodRepository'
       tags:
-        - { name: chill.export, alias: sum_accompanying_course_duration }
+        - { name: chill.export, alias: avg_accompanying_course_duration }
 
     chill.person.export.filter_gender:
         class: Chill\PersonBundle\Export\Filter\GenderFilter
diff --git a/src/Bundle/ChillPersonBundle/translations/messages.fr.yml b/src/Bundle/ChillPersonBundle/translations/messages.fr.yml
index 89d77ab6b..b2cd212e6 100644
--- a/src/Bundle/ChillPersonBundle/translations/messages.fr.yml
+++ b/src/Bundle/ChillPersonBundle/translations/messages.fr.yml
@@ -337,11 +337,13 @@ Fields to include in export: Champs à inclure dans l'export
 Address valid at this date: Addresse valide à cette date
 List duplicates: Liste des doublons
 Create a list of duplicate people: Créer la liste des personnes détectées comme doublons.
+
 Exports of accompanying courses: Exports des parcours d'accompagnement
 Count accompanying courses: Nombre de parcours
 Count accompanying courses by various parameters: Compte le nombre de parcours en fonction de différents filtres.
-Accompanying courses duration: Durée des parcours
-Create an average of accompanying courses duration according to various filters: Moyenne de la durée des parcours selon différents filtres.
+Accompanying courses duration: Durée moyenne des parcours
+Create an average of accompanying courses duration according to various filters: Moyenne de la durée des parcours en jours, selon différents filtres.
+Closingdate to apply: Date de fin à prendre en compte lorsque le parcours n'est pas clotûré
 
 ## filters
 Filter by person gender: Filtrer par genre de la personne