I think it all depends on your self,
and what you like to do in the day / night
if your a easy touch like me and go in a bar in the afternoon and end up buying 3 or 4 girls drinks until
say 7 or 8 o'clock your bar bill will be about 3000 thb could be more like 4k
then you go get something to eat 500thb use the internet .hire a moped 300thb maybe get a taxi back to the nightlife
go bar drink until 2 that's about 2000 then you take a BG back 250 to 500 bar fine plus her 1000 to 2000
so I would allow myself 10 k to be safe
Darbs
