There are some reputable flight schools out there, you know. I learned in the Hughes269C and was charged for flight time only; lift to land, not rotor start to rotor stop. And yes, my log book reflects an extra 5 minutes at the end of the flight sitting on the ground (plus, of course the 5 or so minutes at the start of the flight going through checks). However, with the Hughes/Schweizer, three of those minutes are while the engine is running and the cylinder head is cooling.
Cheers
Whirlygig