When I applied for my fiance visa in July 2017, I had only met my now spouse once, however, by the time the interview in the Embassy took place, we had met in person 3 times. Unfortunately it all got delayed because a positive TB test, which required treatment in country and then Covid, so while my K1 visa application was approved in Feb 2018, my now spouse came to the country in June 2021! During that time I travelled 8 times for a total of over six months of visits and the K1 was approved without issue.