I think 1 to 2 weeks is enough to either eliminate it or include it as an option. Then go back again next time. I stayed in 5 different hotels in 5 different locations over 2 weeks. Three of those hotels offered monthly rates. By the 7th or 8th day I had a good idea about the city and by the end of 2 weeks I realised it is a nice city. The only limitations are wide food variety of Bangkok and limited nightlife. Everything else is good. The malls are good enough, there are good value condos. Some excellent gyms and cheaper than Bangkok. Golf courses, beaches and even mountains nearby. The city even has an airport but not sure what the plans are. A good room with pool and gym including weekly clean is 10,000 to 12,000. Cheaper if rent long term. VIP buses to Bangkok and numerous rideshare apps.