ORIGINAL: opjose
Everyone who I've found that charges their batteries in under an hour is charging at greater than 1C rates, which is usually touted as not healthy for "normal" LiPo longevity and requires higher cost packs or more exotic batteries such as the A123's.
A lot of people also land before the battery is hitting the ESC's low voltage cutoff. If you only fly out 60% of a battery's capacity, guess what, it doesn't take an entire hour to charge it back up again. Deep cycling is also supposedly hard on batteries.