Adult Pit Bulls eat up to 3 times per day but some Pit Bulls may only eat two times per day which can be enough for them.
As long as the Pit Bull is eating dog food up to 2 times per day then the Pit Bull is getting enough food and nutrition.
I would start feeding the Pit Bull at least 2 times per day and if they seem more hungry then you can feed them a third time during the day.
Pit Bulls eat quite a bit of dog food so it can expensive to keep a Pit Bull and feed them so be prepared to spend some money.
A good filling dog food for Pit Bulls is Bully Max dog food that helps them gain weight and fills there stomachs up faster so they tend to eat less of it even though it's a bit expensive.