<qa>  What is fludarabine IV over 30 minutes?- Non-myeloablative preparative regimen:Patients receive fludarabine IV over 30 minutes on days -7 to -3, busulfan IV over 2 hours every 8 hours on days -4 and -3, and anti-thymocyte globulin IV over 8 hours on days -4 to -1. 