Standard Payout: Even though you have placed a withdrawal request, trading limits are not updated until your request is processed by end of the day. 

You can cancel your withdrawal request too.  

Instant withdrawal: Once you place an instant withdrawal request, trading limits will get updated at the same time. You cannot edit or cancel this request. 

Please click on the link for details on how long it takes to process your withdrawal request. 

How much time does it take to process my standard withdrawal request and instant withdrawal request?