My guess on minutes distribution most games this postseason:
STARTERS
White - 38 min
Holiday - 36 min
Brown - 40 min
Tatum - 40 min
Porzingis - 32 min
BENCH
Horford - 25 min
Hauser - 20 min
Pritchard - 15 min
Tillman/Kornet - 10 min (depending on matchups, foul trouble, injuries, etc.)
Brissett deployed as needed to eat some minutes or provide hustle. Springer as well maybe on some key defensive possessions if needed.
I think it's a pretty loaded Top-8 with decent enough depth at 9-10 too. Pritchard/Kornet/Tillman at times may be unplayable and at matchup disadvantages but I think they should be fine early in the playoffs. Maybe in later rounds it becomes a more strict 7 or 8-man rotation.
Overall though, there should be absolutely no reason why 2 of Tatum/Brown/White/Porzingis aren't there at ALL times. Rotate guys in and out but at least 2 of those 4 should be in at all times unless we have a doomsday scenario where like our whole group is in foul trouble lol.