not sure that would be something you could put a time on, I just had a quick google as this is new to me and yes it's the 3rd eye so I'm quite supprised to see there is no mention of the other chakras as one can have a nock on effect with others... so I would search for info on chakras and 3rd eye as well as decalcification.
http://www.spiritualityhealth.com/bl...e-pineal-gland
http://decalcifypinealgland.com/how-...-pineal-gland/
http://www.chakras.info/third-eye-chakra/
http://www.chakras.info/third-eye-chakra-healing/