Each specific character comes with a special gift such as ,,adrenaline rush, beast toung, ancestor guardian, dragon skin etc. If you attempt to use this more than once during a 24 hr period, it will usually say "you have already used this today",, My question is, once you use this special thing,, how long does it last?? Thank you

It varies, but most powers last 60 or 120 secs. You can read more about it http://www.uesp.net/wiki/Oblivion:Powers#Greater_Powers