What is the maximum duration for staying in Thailand within a calendar year?

Inquiring about the longest duration for staying in Thailand within a calendar year, the respondent mentions having stayed for nearly 6 weeks twice in 2025 and planning another 5-week visit. Responses indicate that while there is no strict limit, immigration officers begin to scrutinize entries after about 90 days within a 6-month period or after multiple months in a year. Several users share personal experiences of returning frequently without issues under visa exemption but caution that this could change based on immigration discretion.