Sorry we haven't gotten to this question sooner.
The truth is that i don't know the answer. I would assume that one day wouldn't really matter all that much, and if it were me, i'd stick to Saturdays. I would think that if it were that big of a deal, they'd mention it on their website or in the prescription insert-y thing.
Right now i think your best bet would be to call your doctors office or your pharmacist. B/c, as i said, i don't really have the answer for you (only what *I* would do, and i don't always do the right thing either )
I will leave a note in the Advocate Area asking if anyone else knows ... In the meantime, make some phone calls and see if you can find the answer before i do. And please, if you get an answer, do come back and let me know ... !