As far I'm concerned, using a 365N3 in a SAR duty, with POB 4 (2 pils, 1 HHO and 1 rescue swimmer, plus usual SAR equipments- stretcher, life raft...), we can take off at the MTOW (4300 kg) and full fuel, and are able to reach 120 nautical miles, then to spent 20 to 30 minutes in the hover, then rejoining before reaching the 20 min safety.
Of course, as said previously, depends of the 365 they use....