A.V.
I'd start saving now and take the FT gig. Seven days a week is sure jumping in with both feet after being home for 3 years. Not having any weekends? That will be hard.
I've done FT + PT and frankly I couldn't handle working 7 days a week (plus a night or two, so I worked 8AM to 10PM those days) and I was in college. I burned out.
It would be one of the few times I'd consider using a credit card to float but ONLY if I paid it off IN FULL at the end of the month.