You can place your BID through your broker till 5 PM and can approve mandate till tomorrow 12 PM. I accepted mandate at 8 PM in Antony waste IPO on last day night(Personally verified).
QIB''S 7.12X im applying it, no problem guys this number will increase today evening 4pm around 10x-15x sure.but have to take risk of opening after budget im sure of atleast 20-30% on listing day and good for long term