diff --git a/artifacts/cra-app/src/pages/timesheet-detail.tsx b/artifacts/cra-app/src/pages/timesheet-detail.tsx
index 7f4ddef..bc46edb 100644
--- a/artifacts/cra-app/src/pages/timesheet-detail.tsx
+++ b/artifacts/cra-app/src/pages/timesheet-detail.tsx
@@ -112,6 +112,7 @@ export default function TimesheetDetailPage() {
   const [localDescriptions, setLocalDescriptions] = useState<Record<string, string>>({});
   const [isAddingLine, setIsAddingLine] = useState(false);
   const [hasUnsavedChanges, setHasUnsavedChanges] = useState(false);
+  const [showDays, setShowDays] = useState(false);
   const dirtyKeysRef = useRef<Set<string>>(new Set());
   
   const { data: projects } = useListProjects({ query: { queryKey: getListProjectsQueryKey() } });
@@ -421,17 +422,43 @@ export default function TimesheetDetailPage() {
       </div>
 
       <div className="bg-card rounded-xl border shadow-sm flex-1 min-h-0 flex flex-col overflow-hidden">
-        {isEditable && (
-          <div className="px-3 py-2 border-b flex justify-between items-center bg-muted/20 shrink-0">
-            <Button variant="outline" size="sm" onClick={() => setIsAddingLine(true)} className="gap-2">
-              <Plus className="h-4 w-4" />
-              Ajouter un projet
-            </Button>
+        <div className="px-3 py-2 border-b flex justify-between items-center bg-muted/20 shrink-0">
+          <div>
+            {isEditable && (
+              <Button variant="outline" size="sm" onClick={() => setIsAddingLine(true)} className="gap-2">
+                <Plus className="h-4 w-4" />
+                Ajouter un projet
+              </Button>
+            )}
+          </div>
+          <div className="flex items-center gap-3">
+            <div className="flex items-center gap-1.5 text-xs text-muted-foreground">
+              <span className={!showDays ? "font-semibold text-foreground" : ""}>h</span>
+              <button
+                onClick={() => setShowDays(d => !d)}
+                className={cn(
+                  "relative inline-flex h-5 w-9 shrink-0 cursor-pointer rounded-full border-2 border-transparent transition-colors",
+                  showDays ? "bg-primary" : "bg-muted"
+                )}
+                role="switch"
+                aria-checked={showDays}
+              >
+                <span
+                  className={cn(
+                    "pointer-events-none inline-block h-4 w-4 rounded-full bg-white shadow-sm ring-0 transition-transform",
+                    showDays ? "translate-x-4" : "translate-x-0"
+                  )}
+                />
+              </button>
+              <span className={showDays ? "font-semibold text-foreground" : ""}>j</span>
+            </div>
             <div className="text-sm font-medium">
-              Total: <span className="text-lg text-primary">{grandTotal}h</span>
+              Total: <span className="text-lg text-primary">
+                {showDays ? `${Math.ceil(grandTotal / 8)}j` : `${grandTotal}h`}
+              </span>
             </div>
           </div>
-        )}
+        </div>
 
         <div className="flex-1 overflow-y-auto">
           <table className="w-full text-xs border-collapse table-fixed">
@@ -571,7 +598,9 @@ export default function TimesheetDetailPage() {
                     
                     <td className="px-1 py-1.5 text-center font-medium bg-card sticky right-0 z-10 group-hover:bg-muted/20">
                       {rowTotals[line.id] > 0 ? (
-                        <span className="text-primary text-xs font-bold">{rowTotals[line.id]}h</span>
+                        <span className="text-primary text-xs font-bold">
+                          {showDays ? `${Math.ceil(rowTotals[line.id] / 8)}j` : `${rowTotals[line.id]}h`}
+                        </span>
                       ) : "-"}
                     </td>
                   </tr>
@@ -593,12 +622,12 @@ export default function TimesheetDetailPage() {
                         total >= 8 ? "text-green-700 font-bold bg-green-50" : ""
                       )}
                     >
-                      {total > 0 ? total : ""}
+                      {total > 0 ? (showDays ? `${Math.ceil(total / 8)}j` : total) : ""}
                     </td>
                   );
                 })}
                 <td className="px-1 py-1.5 text-center text-primary font-bold border-t sticky right-0 z-20 bg-muted/80">
-                  {grandTotal}h
+                  {showDays ? `${Math.ceil(grandTotal / 8)}j` : `${grandTotal}h`}
                 </td>
               </tr>
             </tfoot>