diff --git a/src/State/EmployeeRttSummaryProvider.php b/src/State/EmployeeRttSummaryProvider.php
index a195567..dc28e53 100644
--- a/src/State/EmployeeRttSummaryProvider.php
+++ b/src/State/EmployeeRttSummaryProvider.php
@@ -294,17 +294,28 @@ final readonly class EmployeeRttSummaryProvider implements ProviderInterface
             }
 
             // Week spans two months — split proportionally by daily worked minutes
-            $monthMinutes = [];
+            $monthMinutes  = [];
+            $monthWeekdays = [];
             foreach ($detail->dailyMinutes as $date => $mins) {
                 $m                = (int) new DateTimeImmutable($date)->format('n');
                 $monthMinutes[$m] = ($monthMinutes[$m] ?? 0) + $mins;
+                $isoDay           = (int) new DateTimeImmutable($date)->format('N');
+                if ($isoDay < 6) {
+                    $monthWeekdays[$m] = ($monthWeekdays[$m] ?? 0) + 1;
+                }
             }
 
-            $totalWorked = array_sum($monthMinutes);
+            $totalWorked   = array_sum($monthMinutes);
+            $totalWeekdays = array_sum($monthWeekdays);
 
             foreach ([$startMonth, $endMonth] as $month) {
-                $portion = $monthMinutes[$month] ?? 0;
-                $ratio   = $totalWorked > 0 ? $portion / $totalWorked : 0.0;
+                if ($totalWorked > 0) {
+                    $ratio = ($monthMinutes[$month] ?? 0) / $totalWorked;
+                } elseif ($totalWeekdays > 0) {
+                    $ratio = ($monthWeekdays[$month] ?? 0) / $totalWeekdays;
+                } else {
+                    $ratio = 0.0;
+                }
 
                 $result[] = new EmployeeRttWeekSummary(
                     month: $month,