Heya @nathanthomson8 
Great couple of questions, I’m living over on the Savings Pots / ISA side of things now so let’s see if we can get this answered 
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The honest answer is, I don’t know why
but I’ve asked our lovely engineers if it’s something we can work on - we’re making some tweaks to Pots generally (to tidy up some of the wording and make pot closures more straightforward) it’s something relatively simple to implement - we don’t have a timeline on when it’ll be added but it’s certainly on our radar 
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Like almost everything I can think of at Monzo, this is entirely automated
no manual intervention needed 
There’s no specific ‘withdrawal time = landing time’ to Pots - when you make a withdrawal from a Savings Pot, it’ll hit your account by 5pm the next working day 
There’s no way for us to speed this up or cancel it but the second the money reaches us (it needs to travel back from the savings provider 
), it’ll be in your main balance & ready to spend 