It will be a minute tops, celebrations really aren't that long anyway. Though when we're popping five a game with Kane and Madders scoring for fun it might start to add up.
I hope proper time keeping will be introduced in future similarly to basketball/handball because watching a match where something is at stake is often unbearable. This is why recent World Cup was much better because in the end the game was played more or less 90 min instead of 70 min.