<qa>  How many hours does rituximab IV take?- Arm I 2-weekly rituximab: Patients receive rituximab IV 375 mgm2 females and 500 mgm2 males over 4 hours on days 0, 14, 28, 42, 56, 70, 84, and 98. Patients also receive pegfilgrastim subcutaneously on day 4 of each course. 