@opso
My nerve issue in my leg also limits how far I can walk. At 4 1/2 months post-op, I can walk a mile or two, but I found I have less after effects, if I split it up. I walk a mile in the morning, and one at night. (Plus multiple shorter walks). I noticed my nerve issue increases when, I walk up hills, and I found it helpful if I take shorter steps. This also helps a little on flatter surfaces when my leg is acting up more.

You mentioned tight hamstring. In PT, I was instructed on how to do a seated hamstring stretch and taught how to do a sciatic nerve floss. I was further along in my recovery time, so I would only do these if you have an okay and instruction from your Physical Therapist.
Have a great day!😊

Nadine