You mean to make others wait while you do whatever it is you want? Not even for a potty break...
No, you can't, thankfully so
What exactly is your reasoning to ask such a question? Do you need breaks during the game?
Well, you could "reset" the game once or twice, risking the others thinking your quitting, then they bail. No one wants to wait around doing nothing after engaging in poor sportsmanship.
Most good players use the 60 second shot clock. Imagine what a 90 second clock would be if you could just willy nilly your way mismanaging time
One rule I agree with.
Get your stuff done BEFORE you start a game & all you play will enjoy your company