The interview process will vary from applicant to applicant, depending on factors such as the college, subject, availability of tutors and so on. For French and Linguistics at Jesus, I went up on the Monday night, and came back Saturday afternoon/evening, making it a very different experience from subjects like Biology, who only stayed for 2 days at my college.
On the Monday evening I think they mainly welcomed us in and sorted out the admin like keys, fobs, and general paperwork, and we met the other applicants. Then from Tuesday morning people started to have interviews, and we were told to keep checking the noticeboard in the JCR for sudden changes, even if you weren't expecting to have anything that day. Between Tuesday and Friday I had two tests (French and language aptitude), and two interviews in college (one French, one Linguistics). Some people were called to other colleges, but no-one can ever tell if this is a good or bad sign. During the day people pretty much stayed in the JCR, just in case anything changed, and went to hall for meals (which were paid for by the college). Some evenings we went out to eat, but as a lot of people aren't 18 and you have to be back in coll for a certain time, it's not really worth going out properly. Around midday on Saturday we were told to look for our "release notice" on the noticeboard, which just clarifies whether or not you're allowed to go home. One person from Mod Langs had to stay for at least a few more hours to be interviewed elsewhere when the rest of us received our notices.
It really does vary a lot though; a friend of mine applied for Medicine, and was allocated another college aside from the one she personally chose. She stayed at the second college, and had interviews there as well as at her first choice, and only had to be there from Tuesday to Wednesday evening or perhaps Thursday morning. She ended up receiving an offer from her first choice, so you really can't tell how it's going to work out in advance. The best thing to do is to try and get in touch from someone at least from your subject, but preferably your subject
and college, to hear their specific experiences which are more likely to be relevant to you.
Originally Posted by Saucy_Mentality
How common is it to be asked to stay for a third day?
Again, as I found, some subjects/colleges require you to stay for longer than three days as a matter of course, rather than as an exception.