If your bank suddenly burns down, or there is a power outage, a flood, hurricaine. There are all kinds of catastrophies that could cause a bank to be closed more than 2 business days. Hopefully the bank closed, isn't yours or if it is, they have teller branches on standby. The norm for a bank is open 5-6 days a week. Circumstances may arise where they have to be closed for your safety as well
. as their own.