How many hours between meals?

What is the rule?  You aren't supposed to go anymore than 4 hours without eating?

I don't know about a specific rule, but I make sure to go no longer than 3 hours because I start to feel sick.

I'm only 1.5 wks out and and if it is beyond 3 hrs I start to feel ill. A sip of protein shake usually does it well for me.

I'm not sure what the rule is or if there is one, as everyone is different. But for myself I find every 2 hours, I need to have some kind of a meal or snack.