Quote Originally Posted by marciofs View Post
I didn't know that there is a number of times recommended from the company to use their fixers.

I didn't find this information on the bottle...
What fixer are you using?

If it is Kodak Fix, the capacity information is shown on this table (along with a whole bunch of other good info).

If it is Ilford Rapid Fixer, the capacity information is shown on page 2 of this information document (24 rolls per litre of working solution at film strength).

I think it is a general rule of thumb that nowadays, the best source for a lot of technical information is the manufacturer's website.