Thanks for visiting! By default, an IIS application pool (an “AppPool” hereinafter) recycles on a regular time interval of 1740 minutes, or 29 hours. One reason for this time interval is that application pools don’t recycle at the same moment every day (every day at 07.00 for example). However, sometimes you may want to change this regular time interval to specific times. And when you try to configure this in IIS Manager, it gives you an error.