I'm a C-17 driver that just interviewed in July and got a job offer. I think Slinky is 100% correct with his guidance. If you signed for the jet, then I think it is completely legitimate to take credit for the entire time (other time included). I don't think this is a logical stretch or even something that will be addressed in the HR portion of the interview. Even though you're in the bunk, you're still completely resonsible for anything that happens or fails to happen....PERIOD. I wouldn't, however, count any other time prior to your MP/IP/EP designation.
Best of luck!!