So duration of plantar fasciitis is really unpredictable?

No set time.: You might need an injection to hasten recovery. Foot mechanics are very important and a walking evaluation may need to be done. An arch support is very important along with good shoes. The latter may vary in recommendation depending on foot mechanics.

Yes: You are correct, the duration is unpredictable. However, the sooner it is treated, the easier and faster it resolves. Once it becomes chronic (usually defined by over 6 months), treatment time can take longer and more invasive treatments may be necessary.

Depends on you.: Depending on how long it has been going on before you begin treatment, whether there is nerve compression involved, and how aggressive you are with therapy, yes, the duration is unpredictable. The more aggressive you get with supportive shoes, inserts, cortisone injections, stretching, and possible physical therapy, the faster you will recover.

Plantar Fasciitis: Plantar Fasciitis is a stress on the ligament under the arch that attaches at the heel. The treatment should consist of arch support (transfer on weight into the arch from the heel), anti-inflammatory, reduced stress to structure, and stretching of the plantar fascia. I think it takes longer for some patients to heal because these factors are inadequately or over addressed for many reasons.