If you're trying to make up for missed pills, it make more sense to take two today, two tomorrow, and two the next day, and use a condom or some other backup method for the next week. If you're...
Yeah maybe a few minutes early or late wouldn't hurt but if your constantly switching the time then your system will get all confused and might hurt you.
if you miss a day on the pill, you should take two pills (the one for this day and the one for the day before.) so...nothing will happen, it's still effective.