Märklin 78100 Handbuch Seite 18

Operating the device
Display of running time
The time indicator on the display is reset by pressing
the "Time" button (for at least 2 seconds!). Then the
running time which has elapsed since the "Time"
button was last activated is displayed.
18
Time display modes:
00.00 – 59.59 (display shown in minutes, double
point constantly lit, display "min")
00.00 – 99:59 (display in hours, double point
flashes, display "h")