Question about Rituxan Maintenance and Low Blood Counts

I have Follicular Non Hodgkins Lymphoma. I was treated with Treanda and Rituxan for 6 rounds every 21 days. I am in remission - thank God! Now I am having Rituxan maintenance every 2 months. I had my third treatment Oct 3. My WBC (1.5) and RBC (3.1) HGB (10.8) are low. My platelets are ok. I thought by now my blood counts would be going back up.
How long does it take to build your blood counts back up?