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I would be pleased to answer your question
Since your spots which are not exposed to sunexposure are increasing in size I would classify your vitiligo
as unstable .
It is very important to stabilize your vitiligo. If your Vitiligo is increasing in the non sunexposed areas I would suggest that you will need certain oral medications to stabilize ( stop the spread) .
The Oral medication you will need would be available as prescription from the Dermatologist
like short course oral minipulse of steroids
, or tablet levamisole
which are immunomodulatory medications that will halt the spread.
meanwhile , answering your question w.r.t duration of treatments for complete cure it can vary depending on the site of the lesions and can vary from 3 months to 6 years. or even more.