Got a link for rotation time frame recommendations because I have seen them all over the board. I understand the basic one that you want old employees to have

Got a link for rotation time frame recommendations because I have seen them all over the board. I understand the basic one that you want old employees to have no knowledge of current credentials but I have worked with security rotation requirements for minutely, hourly, daily, monthly, and yearly and I've never really seen a reasoning for the difference between them.