[oostevo]

The regulations you're thinking of are ETOPS (Extended-range Twin-engine Operational Performance Standards or, alternatively, Engines Turn or Passengers Swim).

[slake]

Lol! Engines Turn or Passengers Swim! Excellent.

[danielschonfeld]

And those only pertain when you fly out of reach of a suitable airport to land on, in the case of flying on one engine, in still air for > 60 minutes.