Top players who know each other, usually use discord to decide their combined strategy and civ picks. Outside of those players, 1 min is too less in a standard 3vs3 and 4vs4 MP to discuss the same.
It is not binding since players can start the game earlier by selecting “I am ready”.
I guess 90 seconds, 100 seconds or 120 seconds can be fine.
The problem even is that selecting a civ then seeing you need an archer civ in team, not a knigth civ results in going back to civ selection screen, which takes at least 10 seconds. Now you have to hope your teammates didnt change civs as well… you can only change like 2 times with that crazy menu lag