Is April 15 - May 31 enough for one UWorld pass? Dedicated is May 1 - late June; so I won't be able to go hard on UWorld until May
In my opinion, UWorld takes time to figure out. It's such a valuable resource that most people start off spending almost
too much time on each question, but I think it's an important part of the process.
To finish the first pass of UWorld in 45 days, you'd have to average 55 questions per day going every day, no days off. To give you an idea of how long it took me at first (started UWorld in Nov alongside classes):
First 10% of questions: 10 questions, averaged 10-15 min each = ~100-150min. Started toward the 2.5h end and made my way to the 1.5h end over ~3 week period.
Second 10% of questions: 20 questions, averaged 8-10 min each = 160-200min.
Third 10% of questions: 30 questions, averaged 6-8 min each = 180-240min.
Fourth 10% of questions: 40 questions took me about 4 hours.
It now takes me about 3 hours to get through a 40 question block. Of course, the entire trend has been progressive in getting faster and the % and time are rough estimates. The total time spent includes searching/annotating FA, making Anki cards on marked/incorrects and watching relevant Sketchy (or at least looking at the image).
This is a n=1 but a lot of my friends would talk about taking 3-4 hours to finish a 30q block, working their way up to 40q blocks in 4h. It's not hard to find others on SDN/Reddit who say the same. So starting at 55q a day is going to take quite a bit of time, unless your knowledge base is solid as well as your familiarity with FA.
In my opinion, it might be best to ditch Kaplan and get started with UWorld, if your goal is to get through it twice. UWorld isn't the qbank you want to underestimate time-wise and risk barely getting through once. If you started now at 40 questions/day, 6 days a week, that's roughly 10.5 weeks.
Only my opinion though, hope others chime in to give more perspective. Best to you.