Michael,
Sorry to hear about your injury. General guidelines in moving through the levels is based on how you feel with the treatment.
Stay on level 1 until you do not feel much from the treatment, meaning warmth or stimulation. There is no exact time line. It could be 1 day, 1 week or 1 month. It all depends on the individual.
When you move up a level, as long as you do not feel discomfort it, it is ok to continue on that level.
Do not focus on time line as everyone is different, focus on how you feel during and the hours after the treatments. I have attached a link below to further instructions on using the BFST.
http://kingbrand.com/BFST_Instructions.php?REF=34PV15We wish you the best in your recovery and let us know if you have any further questions.