The Numenéra core rulebook says on page 94 that if you rest for the first time on a given day you can take an action to make your recovery roll, the second time you have to spend 10 mins to be able to make the recovery roll, the third time it's one hour, and finally you can make your fourth and last recovery roll for the day after 10 hours.
One of my players brought up the question of whether you are able to select which one of those rolls you make as your first recovery roll. Do you always need to follow the sequence (which does make sense and which I find logical) or could you save up your, say, "one action recovery" for later if you choose the 10 mins recover first after battle, for example? Is this mentioned somewhere?