You don't NEED to have it take less than 1 minute..
when you take the battery out, the computer can remember the settings for only a limited time, after that period of time it will revert to the hardware defaults and you may have to configure your BIOS again...
Before you take the BIOS battery out to switch it, write down all your BIOS settings, as it can be a pain in the ass to find out what setting has been chosen incorrectly and have the previous settings will help greatly...
