If you're young and doing this on the side Buffett's advise has usually been to mainly focus on your career. I like targeting only making one excellent investment per year's savings that you've deeply researched (read all SEC filings, transcripts, media coverage and know all competitors deeply) and intend to never sell. A high standard is about 500 hours on an investment, at 1-2hrs a day and not investing in everything you look at it's hard to have a know-what-you-own approach and buy more than 1 a year... but as knowledge compounds so does your bandwidth over future years. It's puzzling people look at investing in stocks (large businesses) so massively different than they would approach buying a small business.
If you look at Buffett as an example he's probably spent about a quarter million hours at the investment game (=70hr weeks sustained for 70 years?) against maybe <1000 cumulative buy decisions?