What is the minimum number of hyperbaric oxygen treatments you would prescribe for late radiation toxicities?

The RICH-ART Trial from 2019 In Lancet Oncology (Oscarsson et al., Lancet Oncol 2019) utilized 30-40 sessions with good effect. We have typically used a similar protracted treatment schedule for RT cystitis, but I would be curious if others have had success with shorter schedules.

The few times I have had to refer patients for Hyperbaric O2, it seemed like the minimum number of sessions was 30.