But if you've got an official watching the game on video upstairs, it shouldn't take that long.
First off, 99.9% of goals (my estimate, no paperwork to back it up) are not scored as the result of an offside.... and probably 99.8% of them are clearly not the result of an offside.
The refs get the call right, most of the time.
The odd time when this happens, delaying the game for a minute or two while the video review ref makes a final call - is that not better than getting the call wrong?
The time players spend with their arms in the air, hugging each other, crashing the boards, and high-fiveing everyone on the bench... that would be more than enough for a replay guy to say "We got a problem, and we need to take a look at it". It might take a little extra time to determine an offside was missed, for sure, but slowing things down for no reason - I don't think it would happen.
This applies to all sports. I understand that people don't want things to drag on - but if a game takes 3 hours to complete... would it not be better if it took 3 hours and 15 minutes, but was officiated correctly? I watch a ton of baseball too, and I'm always amazed when people place value on the "human element" in calls. I see ZERO value in it. Getting the call right, even at the expense of a few minutes, I don't see being a bad thing for hockey, baseball, or anything.
IF that (offside) goal had happened in the last 5 minutes, it would have been called back - because the NHL automatically reviews everything in the last 5 minutes.... I think that's a silly rule. A goal half way through the 2nd is just as important as one in the last 5 minutes.