It will not affect your birth controll efficacy..if you missa pill for a day then it might affect. ..so continue taking it daily without fail.
I've been on Apri since the April--about 10 months. It's has only been recently that I had an occassion or 2 where I was the half hour late taking it. I read on another site that I should be fine/the pill should work and prevent pregnancy as long as it's taken +/- 2 hours of time it's usually taken. Is that correct?