You do the big maths before you fly. Flight, accommodation, some rough daily number you copied off a blog. Then around day five of a month-long stay you sit down and total up what you have actually spent, and the number does not match.
It is never the rent. It is never the food. It is the eleven small decisions a day that nobody itemises.
Bangkok is not walkable in the way people mean when they call a city walkable. Distances look short on a map and then you are standing on Sukhumvit in 34 degree