How much time it will take to get collateral margin for trade?

If the client is requesting for collateral margin, there is some cutoff time for each broker, if your request arrives before that time you will get the collateral margin in T+1 day. Like Zerodha its 4:00 PM, RKSV its 3:00 PM. After pledge process, relevant stock will be debited from the account until unpledged.