As an expert builder using the grace that God gave me, I laid the foundation, and someone else is building on it. But each person must be careful how he builds on it. According to the grace of God given to me, like a skilled master-builder I laid a foundation, but someone else builds on it.
The most-advanced helicopters can fly up to 300 miles before having to refuel. How long any particular helicopter can fly without refueling depends on the size, weight and age of the helicopter.
A good helicopter will be quick, let you take as many people as you want, and doesn't require stopping every half an hour to refuel.. With the mid-range H125 you can get a range of about two and a half hours at about 135 knots, which will get you about 300-350 miles without refuelling.