You time the inbound portion and correct the outbound to get the time you want (0´-14000´ - 1min, 14001´ and up - 1.5min).
I.e:
You get 50sec inbound, then you have to fly 1min 10sec outbound to get the 1min inbound. Pretty easy
Speed does not matter for the timing portion.
- Gert A. Barring