Time to drive 10 km:
10 km/h — 60 min
20 km/h — 30 min
30 km/h — 20 min
40 km/h — 15 min
50 km/h — 12 min
60 km/h — 10 min
70 km/h — 8:34
80 km/h — 7:30
90 km/h — 6:40
100 km/h — 6:00
110 km/h — 5:27
120 km/h — 5:00
130 km/h — 4:37
Going from 10 to 20 saves 30 minutes. Going from 120 to 130 saves 23 seconds.