Rank Treaty Resign

In a rank treaty team game, is there a window of time you can resign without to be consider a loss?

I’m asking because people in opposite team resign after checking the teammate deck and realizing they have a bad deck. It’s a waste of time to continue the game 3 vs 4 or 2 vs 3.

If yes, what is the window of time?

Thank you!!

I think that is 2min from the start of the game, but im not sure