Waste of time, and complicating the game still further. Will we have to have a fifth official, with a box full of stop watches, to monitor that the players are off for ten minutes, no more, no less. A nice well paid sinecure for a second rate referee there, I guess.
What would be useful (and a good use for the VAR, working with the referee) is the VAR (and maybe an assessor) watching a re-run of the game, slowly and with pauses, re-runs etc. and handing out retrospective yellow cards for simulation, for going down as if caught by sniper fire clutching their face feining a head injury when they've had a slight nudge, time wasting that the referee didn't notice/take action. They could also look at incidents the referee missed/chose to ignore - like being mobbed by players and bottling out of handing out cards at the time.
What would be useful (and a good use for the VAR, working with the referee) is the VAR (and maybe an assessor) watching a re-run of the game, slowly and with pauses, re-runs etc. and handing out retrospective yellow cards for simulation, for going down as if caught by sniper fire clutching their face feining a head injury when they've had a slight nudge, time wasting that the referee didn't notice/take action. They could also look at incidents the referee missed/chose to ignore - like being mobbed by players and bottling out of handing out cards at the time.