I had the opportunity to use BFR with the patients I worked with as a physical therapist technician at an outpatient clinic. The repetition scheme we would use is 30-15-15-15, with a 30- to 60-second rest between each set. We would have patients perform Short Arc Quads (SAQ), Long Arc Quads (LAQ), and, when advanced enough, bodyweight and loaded squats.

Here is a great article that can help provide more info about BFR. Hope this helps!

Cognetti, D. J., Sheean, A. J., & Owens, J. G. (2022). Blood Flow Restriction Therapy and Its Use for Rehabilitation and Return to Sport: Physiology, Application, and Guidelines for Implementation. Arthroscopy, sports medicine, and rehabilitation, 4(1), e71–e76. https://doi.org/10.1016/j.asmr.2021.09.025