I looked at the fomapan after 15 minutes and it had cleared. I actually re-used the same fixer as last time.
I ended up leaving everything in the fixer for 30 minutes just to be on the safe side, but the need for 30' appears to have been a fluke.
My bottle didn't come with a separate info sheet but it has a lot of information on the back of the bottle. I like that you can re-use a liter of mixed fixer for between 15 and 20 rolls of film.