You may only count off campus room and board (R&B) for the time you were actually taking classes, including online classes. So, for June 6-7, count 1/30 of the rent.
Another thing to beware of: 529 money can be use for off campus living, but you are limited to the lesser of your actual costs or the school's "allowance for cost for attendance" (basically what on campus students pay for R&B).
