Jai6638,
I assume your referring to the FAA IR?? Im not sure how many hours you require for it but here in JAA land our IR is either 50 or 55, depending whether you have a CPL already or a PPL. I've nearly finished mine and there is absolutely no way I could have done it in 10 days. I would have been phsically and mentally exhausted trying to do that. At a push, 4 weeks perhaps.