Depends on way too many factors, sir. FDA would say straight up 300g. Keto dieters would say sub 100g. I'm usually at around 100-150g. It depends on your goals, your caloric intake, etc.
very roughly - just for an example
Maint. Cals - 2580 (@ 172lb - BW * 15)
172g protein - 688 cals from protein (26%)
76g fat - 684 cals from fat (26%)
302g carbs - 1280 cals from carbs (47%)
Build your formula around you and your own goals.