any etkt, remains in WL after charting, will get cancelled automatically and the amount will get reflected in your account in about 3 - 4 working days, excl. holidays.
cancelation charges depends on class ( 2S, CC, EC, SL, 3A, 3E, 2A, 1A, FC)
NB: partial WL e tkt ( more than one pax in the same PNR ) wil not get auto canceled, need to get certificate from TTE for WL pax not traveling and then file TDR