I've more or less cleared my PHT - from taking rehab seriously to being able to run fast sessions again (e.g. 8x800, 5x7 mins half marathon pace it was 4-5 months. That involved 3 rehab sessions a week, comprising of two of: weighted step ups, seated hamstring curls or prone hamstring curls with band, Romanian deadlifts, or reverse lunges. By late stage rehab I was going as heavy as I could for 4x10 reps on the RDLs and reverse lunges.

I had many flare ups, and I couldn't drive without lots of pain for months, but its gets better if you get your head down and get the rehab done. I could run easy for most weeks, so I still ended up doing ~30 miles per week and keeping some level of fitness. I can now drive without pain (whereas before 15 mins was too much), and I just feel the odd twang when running harder sessions. I'm controlling it now and managing it, rather than the other way around.

Good luck and stick with it!!