the hours depend on what classes you're taking the first 2 quarters (each quarter is 3 months) at the beginning, you're just doing gen ed, which is 2 or 3 days a week from 8-3 or so. once you start clinicals the hours are about the same. Also, most of the gen ed courses are available online as well, so you can work out a schedule that is best for you.
They are right at the corner of falkenburg and MLK, you can look it up on googlemaps, but it's really easy to get to. I would definetly check out the website, and get in touch with them, everyone there I've dealt with so far has been awesome. I also looked at Everest, which is on MLK right down the street from Rasmussen, Their program is very similar, but the next start is April, which is a night schedule, 3-11pm.
Definetly study! When you order the ATI study guide, first thing, take a practice test to see where you are. You will get a detailed outline of the areas you need to focus on. As long as you have a basic understanding of the material in the study guide, you will do just fine.
The advisors at Rasmussen (as well as all the other schools i went to that required the TEAS) said that a large number of people fail on a first attempt, because of not studying.
But again, if you have a basic understanding of the topics covered in the study guide, you will do well. Good Luck!