Question: what happens if you don't get married on a k1 visa?
Answer: The bad news is that if you go over 90 days without marrying (ie. 90 days and 1 hour), you'll have to submit form I-130 along with your adjustment of status. This will cost you an extra $420 in the form of the USCIS filing fee. ... Try to avoid these “procrastination fees” and get married within your visa period.