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.
This includes 20 hours of dual flight time with a certified flight instructor and 20 hours of solo flight time. If you already have a private pilot's license, you need 30 hours of helicopter flight time, 20 hours with an instructor and 10 solo hours. According to the Professional Helicopter Pilots Association, it can take 30 to 50 hours of flight time before you are ready to take your practical test.