Sean Grande has a few statistics on Aron Baynes in the tweet below. They seem to indicate that playing Baynes for 20-23 minutes per game results in more wins.
I did my own analysis and found that in the Celtics 40 wins this season, Aron has averaged 19.5 minutes. In the 18 losses, he averages only 15.3 minutes. In the wins, he shot 49.1% from the floor and had a plus/minus of +5.3. For the losses, he is at 36.