So far the only thing relative I found for FA is here:
http://web.archive.org/web/20031207083437/http://www.fortuneaffiliates.com/
If you click on “How long do I receive commissions on players I refer?” It says
“For as long as you are an affiliate and promote our website you will receive commissions on players you refer.” This is dated July 2004
As for RB on their front page dated July 2004 it does say lifetime commissions:
http://web.archive.org/web/20041129232203/www.clickedyclick.com/StarSystemGeo.asp?LinkURL=www.referback.com/Index.asp&FCC=RFB&qString=GP=False