diff --git a/pkg/web/html/overtimereport_view.go b/pkg/web/html/overtimereport_view.go
index a7664cc..4329dab 100644
--- a/pkg/web/html/overtimereport_view.go
+++ b/pkg/web/html/overtimereport_view.go
@@ -26,7 +26,7 @@ func (v *OvertimeReportView) formatDailySummary(daily *timesheet.DailySummary) V
 	basic := Values{
 		"Weekday":       daily.Date.Weekday(),
 		"Date":          daily.Date.Format(odoo.DateFormat),
-		"OvertimeHours": strconv.FormatFloat(daily.CalculateOvertime().Hours(), 'f', 2, 64),
+		"OvertimeHours": formatDurationInHours(daily.CalculateOvertime()),
 		"LeaveType":     "",
 	}
 	if daily.HasAbsences() {
@@ -35,9 +35,25 @@ func (v *OvertimeReportView) formatDailySummary(daily *timesheet.DailySummary) V
 	return basic
 }
 
+// formatDurationInHours returns a human friendly "0:00"-formatted duration.
+// Seconds within a minute are rounded up or down to the nearest full minute.
+// A sign ("-") is prefixed if duration is negative.
+func formatDurationInHours(d time.Duration) string {
+	sign := ""
+	if d.Seconds() < 0 {
+		sign = "-"
+		d = time.Duration(d.Nanoseconds() * -1)
+	}
+	d = d.Round(time.Minute)
+	h := d / time.Hour
+	d -= h * time.Hour
+	m := d / time.Minute
+	return fmt.Sprintf("%s%d:%02d", sign, h, m)
+}
+
 func (v *OvertimeReportView) formatSummary(s timesheet.Summary) Values {
 	return Values{
-		"TotalOvertime": s.TotalOvertime.Truncate(time.Minute),
+		"TotalOvertime": formatDurationInHours(s.TotalOvertime.Truncate(time.Minute)),
 		// TODO: Might not be accurate for days before 2021
 		"TotalLeaves": fmt.Sprintf("%sd", strconv.FormatFloat(s.TotalLeaveDays.Hours()/8, 'f', 0, 64)),
 	}
diff --git a/pkg/web/html/overtimereport_view_test.go b/pkg/web/html/overtimereport_view_test.go
new file mode 100644
index 0000000..11518d8
--- /dev/null
+++ b/pkg/web/html/overtimereport_view_test.go
@@ -0,0 +1,85 @@
+package html
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestOvertimeReportView_formatDurationHumanFriendly(t *testing.T) {
+	tests := map[string]struct {
+		givenDuration   time.Duration
+		expectedOutcome string
+	}{
+		"GivenNoDuration_ThenReturnZero": {
+			givenDuration:   time.Duration(0),
+			expectedOutcome: "0:00",
+		},
+		"GivenPositiveDuration_WhenDurationMoreThan30s_ThenRoundUp": {
+			givenDuration:   parseDuration(t, "30s"),
+			expectedOutcome: "0:01",
+		},
+		"GivenPositiveDuration_WhenDurationMoreThan30s_ThenRoundUpEdgeCase": {
+			givenDuration:   parseDuration(t, "1m59s"),
+			expectedOutcome: "0:02",
+		},
+		"GivenPositiveDuration_WhenDurationLessThan30s_ThenRoundDown": {
+			givenDuration:   parseDuration(t, "29s"),
+			expectedOutcome: "0:00",
+		},
+		"GivenPositiveDuration_WhenUnder1Hour_ThenReturnMinutesOnly": {
+			givenDuration:   parseDuration(t, "38m"),
+			expectedOutcome: "0:38",
+		},
+		"GivenPositiveDuration_WhenOver1Hour_ThenReturnHoursAndMinutes": {
+			givenDuration:   parseDuration(t, "1h38m"),
+			expectedOutcome: "1:38",
+		},
+		"GivenPositiveDuration_WhenOver10Hour_ThenReturnHoursAndMinutes": {
+			givenDuration:   parseDuration(t, "10h38m"),
+			expectedOutcome: "10:38",
+		},
+		"GivenPositiveDuration_WhenOver100Hour_ThenReturnHoursAndMinutes": {
+			givenDuration:   parseDuration(t, "100h38m"),
+			expectedOutcome: "100:38",
+		},
+		"GivenNegativeDuration_WhenDurationMoreThan30s_ThenRoundUp": {
+			givenDuration:   parseDuration(t, "-30s"),
+			expectedOutcome: "-0:01",
+		},
+		"GivenNegativeDuration_WhenDurationLessThan30s_ThenRoundDown": {
+			givenDuration:   parseDuration(t, "-29s"),
+			expectedOutcome: "-0:00",
+		},
+		"GivenNegativeDuration_WhenUnder1Hour_ThenReturnMinutesOnly": {
+			givenDuration:   parseDuration(t, "-38m"),
+			expectedOutcome: "-0:38",
+		},
+		"GivenNegativeDuration_WhenOver1Hour_ThenReturnHoursAndMinutes": {
+			givenDuration:   parseDuration(t, "-1h38m"),
+			expectedOutcome: "-1:38",
+		},
+		"GivenNegativeDuration_WhenOver10Hour_ThenReturnHoursAndMinutes": {
+			givenDuration:   parseDuration(t, "-10h38m"),
+			expectedOutcome: "-10:38",
+		},
+		"GivenNegativeDuration_WhenOver100Hour_ThenReturnHoursAndMinutes": {
+			givenDuration:   parseDuration(t, "-100h38m"),
+			expectedOutcome: "-100:38",
+		},
+	}
+	for name, tt := range tests {
+		t.Run(name, func(t *testing.T) {
+			result := formatDurationInHours(tt.givenDuration)
+			assert.Equal(t, tt.expectedOutcome, result)
+		})
+	}
+}
+
+func parseDuration(t *testing.T, format string) time.Duration {
+	d, err := time.ParseDuration(format)
+	require.NoError(t, err)
+	return d
+}