I power off my ipad2 each night, as I find leaving it in sleep mode it still uses up battery power. However, when I switch it off it can take up to 25 seconds for the while rotating circle to stop, and therefore off. Should it take as long as this? I am on ios5, and before upgrading to that, it could take up to 20 secs to power down. I have tried a reset and for maybe once or twice it would power down in a few seconds, then reverts to the longer time. I close all open apps before powering down.