How can I extend my stay in Thailand from 30 days to 60 days after overstaying?

The asker previously overstayed their entry stamp in Thailand and is inquiring about the process to extend their stay from 30 days to 60 days. A commenter clarifies that there is no 30-day visa and indicates that the typical entry is a free stamp, which has recently been adjusted to a 45-day allowance, depending on nationality. Extensions may be available based on the individual's passport.