Hey guys/gals. I have a measly 21,000 hands since may. I want to drill down into PT4 and figure out what's working and whats not (e.g. raising UTG with low suited Aces, x/r flop from blinds, etc). Whats a reasonable sample size to begin to analyze my play?

Now I understand that to feel very confident (maybe within 1 standard deviation or less), you probably need like a 1,000,000 hands. However this is a unrealistic number for me. That's why I am asking for a reasonable sample size.

Thanks!