For me there is a bit of context to this and whether there is a contest for the ball. If green continue to drive, I would presume there were happy with that as the outcome. If the didn't, they could stop, but they might be trying to push it back so fast red cannot get the ball out and ultimately it will be an unsuccessful end and turnover ball. If the ball appears to be being contested, I might allow a little more time to see if it comes out on either side, but generally will be thinking of at least calling "once" and then "use it" or blowing for turnover ball if the team that took it in are not going forward.