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.
Most introductory pilot jobs, besides flight instructor, require the pilot to have somewhere between 500 and 1000 hours piloting the helicopter, with most leaning towards the 1000 hour+ side. The most cost-effective way to attain those hours is as a flight instructor. Flight instructors commonly have about 200 hours when they begin flight instruction. In some models of helicopter, you are required to have 200 hrs before you may instruct. Flight instructors are required to have a minimum of 200 hours.