If you are using typical fixers without hypo-clear, you are looking at wash times of 1 hour plus. You can get a testing agent that will tell you if your prints still contain fixer, and determine exactly how long you need to wash for.
Washing fixer from a print has more to do with a leeching process than running water. So soaking your prints in water that's changed for fresh every ten minutes or so is probably just as good as the several hundred dollar archival washers. I started researching these methods because my washer can only handle 11"x14" prints, and I couldn't afford a larger washer. Do some google searches, and I'm sure you'll find the same articles I did.
I've also switched to using TF-4 for fixer. It's alkaline instead of acid. The manufacturer recommends no acid stop bath, no hypo-clear, and 30 min wash times for FB. I've been using it for about five years now, and really like it. You can get it at The Photographers' Formulary and Freestyle.