8+ Hours to Research a Company
A great resource every investor should use are the BRK Annual Shareholders Meetings which can be found going back to to 1994 on Spotify and Apple podcasts.
In the 1996-Afternoon Session, Warren Buffett talked about taking at least 8 hours to do his research on one company. Warren will read the 10-K of the company he is interested in and then read 8 other 10-K's of companies in the same industry.
This takes Warren about 45 minutes per 10-K so around 8 hours alone just on the 10-Ks. This takes myself a little longer.
That's just on the reading of the 10-Ks! If you ever wonder how Warren can spend so much time reading every day, I think you found your answer.