I had it in December and I got good effects from it within a few days. I had two large infusions rather than 4 small ones. Rituxan was the only thing that cleared up my swallowing. Over the last month or so, though, my swallowing problem is coming back, but it has not gotten to the point it was before the rituxan yet.
It is not common to have effects that quick, but I felt the best about two weeks after the second infusion.
Hope you get good results, too.