53 is playing 2/3. 3/4 like you suggested puts him into that upper 50s range.He should be able to play 53 games or even 55.
Once you get into the upper 50's and 60's...... Not many guys do that anymore, outside of the workhorses (Hellebuyck, Vasilevskiy, Saros) and their teams usually sign BUMS like Rittich, Elliott and Lankinen, who you don't really expect to give 20 starts to, provided their guy stays healthy.