Depends on exactly what you’re doing. If you’re starting a business in Japan for example, it’s fine for the duration of your tourist visa, then you have to leave and apply for a business visa, if you’re doing it in China, or Vietnam, you have to reenter on a business visa. It’s very common to arrange business sponsorships in person in Vietnam on a tourist visa then reenter. IDK about China. Temporary accommodation and living expenses can be extremely cheap compared to the US if you don’t mind sleeping in a hostel and eating street food.
Depends on exactly what you’re doing. If you’re starting a business in Japan for example, it’s fine for the duration of your tourist visa, then you have to leave and apply for a business visa, if you’re doing it in China, or Vietnam, you have to reenter on a business visa. It’s very common to arrange business sponsorships in person in Vietnam on a tourist visa then reenter. IDK about China. Temporary accommodation and living expenses can be extremely cheap compared to the US if you don’t mind sleeping in a hostel and eating street food.