We have made a lot of changes to the withdraw system about a month ago.

1) Users can withdraw normally
2) Users can lock their withdraw
3) Users can permanently lock their withdraw.

So you can't play it a way.

Also have increased hot wallet, so withdraws have been instant since. We have been checking it on a regular basis to ensure quick times.
With large withdraws and/or if it runs out, the user can lock the withdraw.