How long does it take to organize a tourist visa for Thailand and can I switch to a long-term visa afterwards?

The user is seeking information on the organization time required for obtaining a tourist visa for Thailand, specifically asking if four weeks is sufficient. They are also inquiring about the possibility of switching to a long-term visa once in Thailand. Responses indicate varying experiences, with one person stating it took them two weeks to organize their tourist visa from France, while another reported it took less than a week through the Chicago consulate, noting that a Certificate of Entry (COE) took two days.