@Amos *********
you're completely using the wrong term. You aren't renewing anything by doing a 90 day report. All foreigners staying in the country more than 90 days since they entered Thailand, regardless of visa type, must file a report of where they are living every 90 days with immigration. It doesn't extend, renew, or have anything to do with how long you can remain in Thailand. If you exit the country before 90 days, you don't need to file anything, and each entry starts the count over again.