diff --git a/cara/apps/calculator/model_generator.py b/cara/apps/calculator/model_generator.py
index b5c95ca7..958f5310 100644
--- a/cara/apps/calculator/model_generator.py
+++ b/cara/apps/calculator/model_generator.py
@@ -350,7 +350,7 @@ class FormData:
         """
         if not breaks:
             # If there are no breaks, the interval is the start and end.
-            return models.SpecificInterval(((start, finish),))
+            return models.SpecificInterval(((start/60, finish/60),))
 
         # Order the breaks by their start-time, and ensure that they are monotonic
         # and that the start of one break happens after the end of another.
diff --git a/cara/tests/apps/calculator/test_model_generator.py b/cara/tests/apps/calculator/test_model_generator.py
index e0e307d4..328c8f04 100644
--- a/cara/tests/apps/calculator/test_model_generator.py
+++ b/cara/tests/apps/calculator/test_model_generator.py
@@ -303,6 +303,20 @@ def test_valid_no_lunch(baseline_form):
     assert baseline_form.validate() is None
 
 
+def test_no_breaks(baseline_form):
+    # Check that the times are correct in the absence of breaks.
+    baseline_form.lunch_option = False
+    baseline_form.coffee_breaks = 0
+    baseline_form.activity_start = 9 * 60
+    baseline_form.activity_finish = 17 * 60
+    baseline_form.infected_start = 10 * 60
+    baseline_form.infected_finish = 15 * 60
+    exposed_correct = ((9, 17),)
+    infected_correct = ((10, 15),)
+    assert baseline_form.exposed_present_interval().present_times == exposed_correct
+    assert baseline_form.infected_present_interval().present_times == infected_correct
+
+
 def test_coffee_lunch_breaks(baseline_form):
     baseline_form.coffee_duration = 30
     baseline_form.coffee_breaks = 4