If a foreigner leaves Thailand at his 90th day of overstaying, is he/she banned from reentering Thailand for a year, or should it be more than 90 days to be banned from reentering?
TLDR : Answer Summary
A foreigner who overstays their visa in Thailand for 90 days will likely face a reentry ban of at least one year. It's generally advised not to overstay, as such actions can lead to complications not only in reentering Thailand but also in obtaining future visas to Thailand and potentially other countries.