My scenario....
1st November - arrive in Thailand
29th November - fly to Singapore
4th December - fly back to Thailand
3rd January fly to Vietnam
8th Jan fly back to Thailand (for another month then home)
My question is, based on the above plan will I need any visas for Thailand or can I survive on the visa exemption?
TLDR : Answer Summary
Based on your travel plan, you can enter Thailand multiple times under the Visa Exemption rule, especially if you're holding an Australian or Swedish passport. However, it is crucial to note that after your initial stay of 30 days, if your stay extends beyond this without securing a proper visa, you might risk overstaying on your last entry.