Other sites shorten it to 5 seconds, so I think the waiting time depends on the site's setup.  Well, that is the fun of Crash, if you bet at 1000x and the line keep on rising, it will give you enough thrill and confusion whether to cash out or not even before it reaches your bet.  So excitement, hesitation, regret, and great joy has always been a part of the Crash game, the thing is, the crash game emphasizes this feeling because of the time duration that makes us experience these feelings at a longer time each roll.