How many hands would you guys say it takes before you can decide if you're a winning player as opposed to running hot?

I've got 36K hands in PT in the four months I've been playing and I'm ahead roughly 1,000 playing .5/1 NL tables.

Can I safely say that I play to a profit at that limit in the long run?

Also, what does a good player expect to make an hour four-tabling .5/1 NL?