As many as there can be, As long as they keep tieing they can be as many as possible.
If a game is that miraculous then Yes it can go 5 overtimes
as many as needed, games are usually decided in 1 or 2, but there is no limit
how many games are played in a regular nba season
As far as college and NBA is concerned, there is no limit as to the number of overtimes that can be played before determining a winner of the game.
As far as international, NBA, and US college basketball is concerned, there is no limit as to the number of overtimes that can be played.
Bulls vs Celtics with 6 overtimes Indianapolis Olympians vs Rochester Royals with 6 overtimes
Usually an overtime lasts 5 minutes but it depends how many overtimes they go in to.