I looked it up a while back and apparently the new SAT is only 4-5 hours long, which really put it in perspective for me how nuts[0] Caltech final exams are (especially when a typical finals week for me has several at once) :-P
[0] I mean this humorously, not insultingly—I also don't regret choosing Caltech in the slightest.
Except for the Math 108 exam for which I had six hours and finished in 3 because I did not know the meaning of the remaining 2-3 questions. Ugh.
I might change a few things. Caltech faculty were singularly unhelpful in getting me into grad school.
Of course I wouldn't change anything. :)