Hey Speedyg96,
To answer your questions:
1. Provided you're talking about he Computer Based Aptitude Test (the one at RAF Cranwell), the answer is no. It's all sat on a computer, and you go through a series of tests over the course of one very long day. A lot of the S/D/T is with context - there are scenario's given that require you to do the maths. None of them are massively complex because you get very little time in which to answer the question.
2. I did for Pilot which was the longest. I started at about 7am and finished at like 3pm ish. So I can imagine it will be a bit shorter than that. That includes a lunch break and a 5 min break every hour or so.
3. Can't answer that one!