I have made 2 payments to PayPal neither have been debited from my account even though was nearly a week ago they show as completed on PayPal but don’t exist on monzo
If they were direct debit payments they can take ages to show
Yep PayPal is a weird one.
I have payments which PayPal shows well before, yet the payment only showed up today.
It’s a direct debit, and they arrange it well ahead of time I guess. Nothing to worry over 
It’ll show have faith, I think the maximum amount of time I’ve waited for it to show up as requested is 8 - 9 days. It’ll show completed on PayPal side as they credit it, regardless of actually getting their hands on the money.