Accessory Belt Change Interval

Good day!

I've used both the Search and Advanced Search but have not come across a thread talking about accessory belt replacement. The best I've found (online) is keep checking it...

Have you changed yours? At what mileage?

I know YMMV, but I just want a ballpark as I'm creating a "maintenance spreadsheet" that will hopefully remind me before the Maintenance Minder does so I can stop eating out for a month or two to save $ for the job.

TYIA & have an awesome day!