But I think, if they really wanted to, many cricket reviews could be way quicker. A bit of showbiz has crept in, with the reviewer dragging it out when common sense should allow them to cut the process short. That game is ripe for someone to make that method less slavish in the way it proceeds. And in football, there would surely be a more limited review, with no 'snicko' stuff and maybe just two key camera angles to assess.
I really think if you tried that and timed it, and then timed footage of a ref telling crowds of players to go away, then him jogging over to his assistant, both of putting their hands over their mouths and mumbling something, then the ref jogging back and maybe showing someone a red or disallowing a goal, the difference in time would be negligible.