After seeing there was a feed for 2015 we thought it would be a good idea to set medical date to interview date to give others (like myself an idea of time frames) - if you have had a medical in 2016 and also interview date please add to the list below. Feel free to start the dates off - I am currently waiting for my interview date but the moment I get it I will update!
Copied the below from Nich-Nick and the feed for 2015 - The question is asked over and over. The times vary. Here is a list of some real people from the UK forum. There are reasons why some are different. Maybe they didn't send their Readiness Form immediately. Maybe they had to get additional info from their GP which delayed their medical forms getting to the embassy. Maybe they said they weren't planning to marry for four more months, so the embassy shoved them back. However I think most of these people were pushing through as fast as they could.
This is raw data for what it is worth to those who ask the "how long?" question. The date is the interview date. Copy the list and add your info in interview date order. Don't ask questions, or chat, or explain, or say "can somebody add me?". If you can't copy the list and add yourself, then PM somebody and ask them to do it for you. Let's keep it clean and simple
Each consulate has a different process. London explains theirs on the embassy website. I think if you read this page, you will understand they pick the interview date/time https://uk.usembassy.gov/visas/fiancee-2/applying-for-the-visa/
Here's how long it has taken other people to interview. It could be a couple of weeks before you get the letter. http://www.visajourney.com/forums/topic/549078-medical-to-interview-date-how-long-2015-data/page-3?hl=%26quot%3Bmedical+to+interview%26quot%3B#entry7883281
