Our help articles have a handy guide about this -
Deposits will only be processed during working hours (8am-4pm, Mon-Fri), and in batches. During this time, you should expect up to 4 hours for your money to arrive, although we hope to allocate it to your account sooner.
quote from here
You also have the option to use Apple Pay now, which takes less time -
Although it costs us more so we’d be grateful if you could use bank transfers if you’re not in too much of a hurry 