If you enjoy the nightlife you will not have enough.
I rent a fully furnished condo in Bangkok near asoke
*****
baht a month. Water and electricity is not even a 1000 baht.
Have WiFi, netflix, swimming pool, gymnasium, sauna etc all in.
So that
*****
0 baht one year.
Depends on your lifestyle but a 1000 baht a day for eating is more than enough.