I don't like to call it hour building, when it involves increasing ones hours via a proffesional pilotjob ..
For me hour building is something you do like between PPL and CPL, flying on your own. It's a "just need to increase the hours, don't really care how" way ..
I hate to have an instructor who is just there for "hour building", instead of being a proffesionel instructor, who is really involved and present, focused, not caring if he/she got 3 or 4 hours logged today, not just being in that other seat for the hours. But instead was truely proffesionel ..
I don't know, maybe its potatos and potatos for some. I just see a difference in attitude and seen both types of instructors ..
Anyway: 300 hours and 100 PIC is JAA requirements for becoming an instructor. JAR-FCL 2.335 section (a) ..
Those I know of has paid for the hours, hour building to achieve the 300 / 100 hour figures ..
- madman