3 I think but it could be 4
Edit : it has to be 3 or 4 games because on playoffs we have 5 games that will be played in 4 days (2 Bo3 every day and last day a Bo5 ) and game stage should be played on 5 days that means 16 games in 5 days who is the same has 3 Bo3 every day and one day with 4 Bo3