The Shulchan Aruch (OC 473:2) rules that after the first cup at the seder, one doesn't make an after bracha. The Mishnah Berurah (s.k. 11) explains that we rely on benching after the meal to cover it, or the bracha achronah after the last cup.
I've heard that the poskim ask how can we rely on this, when (usually speaking) Maggid can take over an hour to complete, usually meaning that the shiur ikkul has passed (a person is as thirsty now as they were before they drank), making them lose their after bracha.
What are the answers to this question? I'm looking for as many as possible.