@Russ ********
, not really.
entering on Torusits visa is up to 90 days. Visa-exempt entry is up to 60 days, both including tourism extensions. That is only what we can say for sure.
And yes, you can apply for a tourist visa in neighboring countries.
Now, How many times can you do those back-to-backs? It depends on the immigration officer at the passport control on your entering Thailand. Eventually, when the IO gets doubt, you would be pulled aside and asked about your purpose for staying in Thailand, etc. Some people got asked at the second entry, and some could go through passport control many times without being questioned.