Hello, all. I'm a college student who used to be very active but, unfortunately, lost most of it in my years of college. I've decided I want to get back to that and I think Power 90 would be a great way to ease back into it (plus, I failed the P90X fit test pretty bad

). Anyways, the only catch right now is that I'll only be doing it for 4 (maybe 5 if I'm lucky) days out of the week. I know I won't get crazy results with this but I've made work and (especially) school bigger priority for the time being.
I'm very very very lucky to have a job that is willing to work with my school schedule so I know I'll be able to work out over the weekends. The problem is that my work days during the week will be very random since my shifts are not set in stone. I'll probably be working 3 out of 5 weekdays but the exact days will change week to week. So, in summary, I'll be working out Saturday, Sunday, and 2 days during the week.
Keep in mind, I'm 100% aware that I won't get amazing results in 90 days because of this and I'm more than ok with that. If anything, I just want to be somewhat active so I don't feel horrible 24/7. Plus, I imagine that my schedule won't be as crazy after I graduate so I definitely plan on doing Power 90 the "correct" way eventually and possibly even graduate up to P90X.
Anyways, I thought I would ask if there's anything horribly wrong with this? Possibly even someone who's had this exact experience, as well? Any tips on doing things this way? Any and all feedback is welcome. Thanks!