How late is to late?

I've been reading online that you have an hour or two until from your original scheduled time that it's considered too late to take the pill. I forgot to take my pill on the scheduled time, but took it an hour and 15 later, and my SO and I had sex the same and came in me. So how late is too late to take the pill of the day before you have to have a back up birth control like a condom for a week?