I think a distinction needs to be made for people recovering from PCS.

- First you need to rest (physically and mentally) in order to get symptom-free (or to a relatively low level of symptoms). You really have to curb or limit exercise during this phase if it's exacerbating symptoms. This may take days, weeks, or months.

- Then you can start adding exercise (likely something gentle like slow walking with cushioned shoes, or some very easy stationary cycling, to start).

I don't think you can do a lot to speed up the first (ie, resting) stage of recovery, apart from the usual suggestions (getting lots of rest, good nutrition, limiting stimulation, minimizing stress, etc). But there is no hard and fast rule. I am at 11.5 months PCS and was barely able to walk initially - even a brief walk outside could make me feel horrible. Now my pace is better and I'm typically doing a couple of walks a day (up to 35 mins and counting) in addition to household chores and various forms of cognitive work. I'm feeling a lot better overall but it has been slow and steady as she goes.