"Wash until the paper has no fix left in it".
If you are a good analog B&W photographer, you know the tests that are available. If not, read up on it. It has been posted over and over and over here on APUG.
I hate to put it this way and kind of apologize, but having been one of the posters, I'm getting tired of it. Also, if you are not an inveterate B&W photographer, you may be jumping into color too quickly. Just a thought to pass on. I get testy sometimes so forgive me please.
I suggest you read the Kodak color Dataguide with a list of chemicals and visit their website for literally pages of information that can help you.