The key is to make haste slowly.....do the seat belt in one try...not fumble three...four tries...one guy straps in...the other does the start....transfer of controls...one finishes the run up...the other straps in...all run-up checks done at start of the shift....checklist done by pattern and double checked by the non-flying guy.
Once got a Chinook off the ground in 50 seconds from the first rocket landing adjacent to us.