I don't understand.
so with TV commercials, it is 57 mins
without it is 30 mins?
so what happens when there is tv commercials, does the players stop playing and wait for the sign that the video feed is back
There are known stops in play for side change, in between sets, etc. In big TV matches, like the finals, the breaks are extra long to allow for more commercials. So the players actually get more rest time. If you want millions in TV $$, you must bow down to the TV gods of ad sales.
If you have ever been to a NFL/college football game, you will see during breaks in play a TV guy with a headset steps onto the field. The head official takes his orders from this guy. The game continues when the TV guy gets the signal from the TV director that the commercials are done. The bigger the game, the longer the commercial breaks are.