How long does it take for a bank transfer of a large some of money to be processed into my monzo account?
As soon as Monzo receive it, it will show, there’s no “processing”.
I’m assuming this is a transfer from another UK bank?
Welcome! Depending on how large the sum is, if it’s over £10,000 you should start an in-app chat to make sure Monzo are aware and it doesn’t get flagged.
If it’s less, it should appear as soon as Monzo has it, any delay will be from the originating bank.