I set time box of 5 days for myself (2 hrs/day) and was able to achieve it before timebox expiry :)
Day1:
I started with Scrum Guide. Advise is - do NOT plan to read it in hurry.
Plan to spare good 2 hrs for reading and understanding it thoroughly. While reading you will come a cross few items which you are not aware of
or which you find confusing. That's where you have to spend more time (I was able to find blogs for most of these items on scrum.org site iteself).
Registered and bought PSMI assessment. That's all I did on Day1.