Every player has a different path to earning playing time in the NBA.
There are a few different paths players. For some, mainly high-end draft picks, they’re given minutes right off the bat to learn, and adapt to the NBA game. Others have to sit and wait their turn behind veterans, and players who have established themselves in the league, and on their current team.
For the Orlando Magic’s Khem Birch, he’s had to wait his turn behind a veteran starter in Nikola Vucevic, and a top-10 draft pick in Mo Bamba.