Under 14 CFR 91.151(b), no person may begin a VFR flight in a rotorcraft unless, considering wind and forecast weather conditions, there is enough fuel to fly to the first point of intended landing and, assuming normal cruising speed, to fly thereafter for at least:
- A15 minutes during day or night
- B20 minutes during day or night
- C30 minutes during day and 45 minutes during night
- D45 minutes during day or night