My Retirement Plan

Billy; with a requirement of B 50,000/mth (600k/year) (in todays money) the conservative rule of thumb is that you can withdraw about 4-5%/year+inflation from a well diversified stock/bond portfolio and survive a looong time without even eating the nest egg. So you would need about 12M Baht being USD 300.000. If you want to buy a condo in Pattaya that is from Baht 1M and up depending on size/location.

With your current net worth and income/savings potential you should be closer to USD 1M in 20 years time.

note: Things like medical insurance might go up in cost faster than general inflation.

Cheers!