None is set aside, per se - there's no time set aside during the classroom part of the curriculum. You schedule step 1 yourself, depending on how long you're planning to study for it.
After the end of Q3 of 2nd year, you're done with preclinical stuff. Spring break (2 weeks) is right after that, so some people will take the first half of Q4 off (4 weeks), wrap it in with their spring break, and study / take the test in those 6 weeks.
More commonly, people schedule around 8 weeks off between Q4 of 2nd year and Q1 of 3rd year and take it then. Each quarter is ~ 8 weeks, and each summer period (there are 3) is 4 weeks, so you can sort of mix and match. Core clerkships are only offered for 8 weeks at a time, but there's flexibility to mix in a 4 week elective or emed (which is 4 weeks).
Whenever they do it, I'd say in general people take around 5-6 weeks to study full time, then take the last 2 weeks as a vacation after the exam and before going back to the wards. That way you get a little bit of a break, and you have the ability to push the exam back if you really need to. But you can do as little or (almost) as much as you want - it's all up to how you schedule it.
(These boards are probably not the place to say this, but you really don't need more than 6 weeks to study for the exam. The preclinical and clinical training prepares you well for the big concepts, and you only need about 6 weeks to cram minutae. And most people that I know feel like they peaked around 6 weeks anyway; more than that and you just start to freak out.)
So excited to be coming here in the fall!
🙂
