How many days before my visa expires can I apply for a new multiple entry Non-O visa in Savannakhet?

@Dan *****

no problem doing it now, Savannakhet will sell you a year-long, multi-entry Non-O without a problem.

Unless you travel a lot or something, you might as well get as long as you can out of the visa you have ..

@Dan *****

You could bounce out and back in one last time just before the 26th and get another 90 days, AND as robert said after that you could get the 60 day visit family extension for 1900baht at the immigration office.

Doing that means you wouldn't really NEED to go get a new visa for 5 months

Normally if the visa is still valid they not give another visa. Just make a border run, get a new 90 day of stay. You can even extend this stay with another 60 days at Immigration with reason of family visit without the financial requirements.