1) I read about and interesting stock and then put it in my watchlist (~1-2h)
2) When my purchase price is reached I by a first position. I do more research to determine if it's worth a larger position (1-2h), or pot. Sell.
3) Each time, I bump up position, I spent a little bit more on research (0.5-1h).
4) When i sell, (typically after predetermined target price is reached), i also do check to determine, if a higher target price is warranted.(0.5h)
I have a diversified portfolio with typically ~30 positions, in various stages of value creation.