Hi swapna,
 if ur interview is at 8.30, it will be completed by 12 noon.
 during first 1-2 hours they will check all certificates .
 maximum the interview will be copleted between 10-30 to 12.
 last year i attended SBI interview  on morning session,it was completed by 10.45A.M.
this time i am having interview on 26 th may in hyderabad