diff --git a/addons/sale_timesheet/models/sale_order.py b/addons/sale_timesheet/models/sale_order.py
index 30707fd6486..fad76f7a94d 100644
--- a/addons/sale_timesheet/models/sale_order.py
+++ b/addons/sale_timesheet/models/sale_order.py
@@ -31,15 +31,8 @@ class SaleOrder(models.Model):
     @api.depends('timesheet_ids', 'company_id.timesheet_encode_uom_id')
     def _compute_timesheet_total_duration(self):
         for sale_order in self:
-            duration_list = []
             timesheets = sale_order.timesheet_ids if self.user_has_groups('hr_timesheet.group_hr_timesheet_approver') else sale_order.timesheet_ids.filtered(lambda t: t.user_id.id == self.env.uid)
-            for timesheet in timesheets:
-                timesheet_uom = timesheet.product_uom_id or timesheet.company_id.project_time_mode_id
-                if timesheet_uom != sale_order.timesheet_encode_uom_id and timesheet_uom.category_id == sale_order.timesheet_encode_uom_id.category_id:
-                    duration_list.append(timesheet_uom._compute_quantity(timesheet.unit_amount, sale_order.timesheet_encode_uom_id))
-                else:
-                    duration_list.append(timesheet.unit_amount)
-            sale_order.timesheet_total_duration = sum(duration_list)
+            sale_order.timesheet_total_duration = sum([timesheet.unit_amount for timesheet in timesheets])
 
     def action_view_project_ids(self):
         self.ensure_one()