For every craps bet you make, the house has a mathematical edge. Over a short period of time, it's not uncommon to beat the odds and come out ahead. But that gets less and less likely the longer you play, and how you split up your sessions has no effect.
Think of flipping a coin that's slightly unbalanced so that it comes up heads 51% of the time. Flip it 100 times and you could easily get more tails than heads. Flip it a million times and it's virtually certain there will be more heads. And it wouldn't make any difference if you did the flips in separate sessions and "stopped" a session whenever you had 10 more heads than tails.