We had to go back and check admittedly, because we weren't originally confident on the exact 20/30 duration. Either way, it should be clear when we're referring to; as I recall it has since always been ~4h windows.
Many are deliberately designed to be difficult, but answers to all fifteen questions can be found (if you don't know them already) on official sites if you look around. If everyone already knew every answer then aside from being no fun or a challenge, everyone would receive no reward.How the hell should i know respost for all quest in trivia event?
I may know 1/2 max