diff --git a/editor/editor_tests/opening_hours_ui_test.cpp b/editor/editor_tests/opening_hours_ui_test.cpp
index 7e60af8ab4..6d5014e095 100644
--- a/editor/editor_tests/opening_hours_ui_test.cpp
+++ b/editor/editor_tests/opening_hours_ui_test.cpp
@@ -31,6 +31,7 @@ UNIT_TEST(TestTimeTable_ExcludeTime)
 {
   using osmoh::operator""_h;
   using osmoh::operator""_min;
+  using osmoh::HourMinutes;
 
   {
     auto tt = TimeTable::GetPredefinedTimeTable();
@@ -123,34 +124,50 @@ UNIT_TEST(TestTimeTable_ExcludeTime)
     TEST(tt.AddExcludeTime({10_h, 11_h}), ());
     TEST(tt.AddExcludeTime({12_h, 13_h}), ());
     TEST(tt.AddExcludeTime({15_h, 17_h}), ());
-    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetStart().GetHourMinutes().GetHoursCount(), 18, ());
-    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetStart().GetHourMinutes().GetMinutesCount(), 30, ());
-    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetEnd().GetHourMinutes().GetHoursCount(), 22, ());
+    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetStart().GetHourMinutes().GetHoursCount(), 20, ());
+    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetStart().GetHourMinutes().GetMinutesCount(), 0, ());
+    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetEnd().GetHourMinutes().GetHoursCount(), 21, ());
     TEST_EQUAL(tt.GetPredefinedExcludeTime().GetEnd().GetHourMinutes().GetMinutesCount(), 0, ());
 
     TEST(tt.AddExcludeTime({18_h, 23_h}), ());
-    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetStart().GetHourMinutes().GetHoursCount(), 13, ());
-    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetStart().GetHourMinutes().GetMinutesCount(), 30, ());
-    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetEnd().GetHourMinutes().GetHoursCount(), 14, ());
-    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetStart().GetHourMinutes().GetMinutesCount(), 30, ());
+    auto const predefinedStart = tt.GetPredefinedExcludeTime().GetStart().GetHourMinutes();
+    auto const predefinedEnd = tt.GetPredefinedExcludeTime().GetEnd().GetHourMinutes();
+    TEST(predefinedStart.GetHours() == HourMinutes::THours::zero(), ());
+    TEST(predefinedStart.GetMinutes() == HourMinutes::TMinutes::zero(), ());
+    TEST(predefinedEnd.GetHours() == HourMinutes::THours::zero(), ());
+    TEST(predefinedEnd.GetMinutes() == HourMinutes::TMinutes::zero(), ());
   }
   {
     auto tt = TimeTable::GetPredefinedTimeTable();
     tt.SetTwentyFourHours(false);
 
     tt.SetOpeningTime({8_h, 7_h});
-    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetStart().GetHourMinutes().GetHoursCount(), 13, ());
-    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetStart().GetHourMinutes().GetMinutesCount(), 45, ());
-    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetEnd().GetHourMinutes().GetHoursCount(), 1, ());
-    TEST_EQUAL(tt.GetPredefinedExcludeTime().GetEnd().GetHourMinutes().GetMinutesCount(), 15, ());
+    auto const predefinedStart = tt.GetPredefinedExcludeTime().GetStart().GetHourMinutes();
+    auto const predefinedEnd = tt.GetPredefinedExcludeTime().GetEnd().GetHourMinutes();
+    TEST(predefinedStart.GetHours() == HourMinutes::THours::zero(), ());
+    TEST(predefinedStart.GetMinutes() == HourMinutes::TMinutes::zero(), ());
+    TEST(predefinedEnd.GetHours() == HourMinutes::THours::zero(), ());
+    TEST(predefinedEnd.GetMinutes() == HourMinutes::TMinutes::zero(), ());
   }
   {
     auto tt = TimeTable::GetPredefinedTimeTable();
     tt.SetTwentyFourHours(false);
 
-    tt.SetOpeningTime({7_h, 7_h + 45_min});
+    tt.SetOpeningTime({7_h, 8_h + 45_min});
     TEST(!tt.CanAddExcludeTime(), ());
   }
+  {
+    auto tt = TimeTable::GetPredefinedTimeTable();
+    tt.SetTwentyFourHours(false);
+
+    tt.SetOpeningTime({19_h, 18_h});
+    auto const predefinedStart = tt.GetPredefinedExcludeTime().GetStart().GetHourMinutes();
+    auto const predefinedEnd = tt.GetPredefinedExcludeTime().GetEnd().GetHourMinutes();
+    TEST(predefinedStart.GetHours() == HourMinutes::THours::zero(), ());
+    TEST(predefinedStart.GetMinutes() == HourMinutes::TMinutes::zero(), ());
+    TEST(predefinedEnd.GetHours() == HourMinutes::THours::zero(), ());
+    TEST(predefinedEnd.GetMinutes() == HourMinutes::TMinutes::zero(), ());
+  }
 }
 
 UNIT_TEST(TestAppendTimeTable)
diff --git a/editor/opening_hours_ui.cpp b/editor/opening_hours_ui.cpp
index 1334512cb8..cf72296cc0 100644
--- a/editor/opening_hours_ui.cpp
+++ b/editor/opening_hours_ui.cpp
@@ -252,27 +252,38 @@ bool TimeTable::IsValid() const
 osmoh::Timespan TimeTable::GetPredefinedOpeningTime() const
 {
   using osmoh::operator""_h;
-  return {10_h, 22_h};
+  return {9_h, 18_h};
 }
 
 osmoh::Timespan TimeTable::GetPredefinedExcludeTime() const
 {
   using osmoh::operator""_h;
   using osmoh::operator""_min;
+  using osmoh::HourMinutes;
+
   auto longestOpenSpan = GetLongetsOpenSpan(GetOpeningTime(), GetExcludeTime());
 
-  auto const longestOpenSpanLength = SpanLength(longestOpenSpan);
-  auto offset = longestOpenSpanLength / 4;
+  auto const startTime = longestOpenSpan.GetStart().GetHourMinutes().GetDuration();
+  auto const endTime = longestOpenSpan.GetEnd().GetHourMinutes().GetDuration();
+  // We do not support exclude time spans in extended working intervals.
+  if (endTime < startTime)
+    return {};
 
-  auto const remainder = offset % 10;
-  if (remainder && remainder != 5)
-    offset -= remainder;
+  auto const startHours = longestOpenSpan.GetStart().GetHourMinutes().GetHours();
+  auto const endHours = longestOpenSpan.GetEnd().GetHourMinutes().GetHours();
 
-  longestOpenSpan.GetStart().GetHourMinutes().AddDuration(osmoh::HourMinutes::TMinutes(offset));
-  longestOpenSpan.GetEnd().GetHourMinutes().AddDuration(-osmoh::HourMinutes::TMinutes(offset));
+  auto const period = endHours - startHours;
 
-  if (SpanLength(longestOpenSpan) < (30_min).count())
-    return osmoh::Timespan{};
+  // Cannot calculate exclude time when working time is less than 3 hours.
+  if (period < 3_h)
+    return {};
+
+  auto excludeTimeStart = startHours + HourMinutes::THours(period.count() / 2);
+
+  CHECK(excludeTimeStart < 24_h, ());
+
+  longestOpenSpan.SetStart(HourMinutes(excludeTimeStart));
+  longestOpenSpan.SetEnd(HourMinutes(excludeTimeStart + 1_h));
 
   return longestOpenSpan;
 }