If you're trying to plan the absolute latest you can arrive, you're thinking about this the wrong way.
Because 1iota tickets are free, about half the folks who reserve their tickets don't use them. We have to overbook in order to be sure that we can fill the studio.
Having tickets are not a guarantee of admission, and arriving late means you could possibly be turned away. We unfortunately have no way of predicting the behavior of everyone else who receives tickets, and so it's possible that everyone but you arrives early, and you wouldn't be able to attend.
Early arrivals have the best chance of admittance. We typically recommend planning on arriving 30-45 minutes before the time on your tickets. We get it- waiting in line's not the most fun. But it's unfortunately the tradeoff you make for getting to see your favorite shows and celebs for free.