How long does it take for a cashiers check to clear in the UK form a USA bank?

How long does it take for a cashiers check to clear from a US bank to a UK bank?How long does it take for a cashiers check to clear in the UK form a USA bank?
If it is a certified check you can expect it to take up to 5 work days. If it is with a bank that has relations with a British bank they can do it in 3.