How many O visas for visiting family can you apply for in a year?

The number of Non-O visas you can apply for to visit family in Thailand within a 12-month period is generally not limited, as it depends on the discretion of the Thai immigration authorities. It's important to note that applying for a Non-O visa for visiting Thai family is often related to marriage; however, the process for obtaining an extension of stay may change if you're married to a Thai national.