How many hands is enough to determine if you are beating a particular level? I have 10K hands now at 10NL FR, but my graph looks filled with variance. I had a decent start, but then I ran into a dry spell of cards and an even worse period of getting stacked by sets and oversets.

I'm a tourney-convert, so I'm way over-rolled for 10NL and eager to move up to 25NL. I told myself I'd first get to 10K of hands and see how things were going before assessing whether or not to level up. Now I just feel confused. Any thoughts?