Remove unused second part of the expiry counter

internal/config/parse.go

@@ -123,6 +123,13 @@ func FormatDuration(d time.Duration) string {
 	case d%time.Hour == 0:
 		return fmt.Sprintf("%dh", d/time.Hour)
 	default:
-		return d.String()
+		// Duration.String() spells out every unit below the largest one, so a
+		// whole number of minutes arrives as "1m0s". Drop that tail, but only
+		// when the seconds really are zero: "1m30s" has to keep them.
+		s := d.String()
+		if strings.HasSuffix(s, "m0s") {
+			s = strings.TrimSuffix(s, "0s")
+		}
+		return s
 	}
 }