How long does it take for a pill to be "late?"

Ma
I started Aubra a week ago today (in the middle of my cycle... I was told that I could) and I've taken each pill within an hour of the time I started it. For example, I'm supposed to take it at 8PM. But on a couple of those nights, I had to take it at 8:30 or like 8:45ish because I was late for work. I've refered to the pamphlet, but can't find any info on how late is a late or missed pill. How long is it until it's considered late and need to double up? According to this app, it's something like 3 hours. 

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