It depends on your reading level and your ability to immerse yourself in the book. Seeing that you are a student (and not a teacher), I would ask yourself a couple of questions. The first would be how long you anticipate each night devoting to the book. From my own personal experience of reading the book, I can't see Hawthorne's book being done in one setting and having make any comprehensible sense. This book is a fairly intense study of human nature and the challenges of social ostracizing and hypocrisy. There is much in here that takes time in digesting intellectually, and his style of writing can prove to be a challenge. I would say an interrupted set of 45 minutes to an hour would be appropriate. The second question I would ask is if you plan on having any type of assistance with you as you read. Using the enotes summary or another type of summary device could be a very helpful guide to you as you read. You should use it in conjunction with the reading, and not a substitute for it. I think this will add about twenty minutes to your reading time. The last question I would ask is how long you have for the time period of reading the book. If you have a week and a half to two weeks, you could average about 20- 30 pages a night and get the book done. I would also have to ask if you are receiving in class time to read, as well, or will this be strictly done outside of class. That might impact your reading time for it. I didn't address it here, but if you have nightly assignments with it, such as questions, writing prompts, worksheets, these will add on to your time, for while you could do them while you read the work, I wouldn't suggest it.
Having said all of this, it's a good read and is fairly important to American Literature. Students I have worked with have not really enjoyed reading it, but liked the ideas coming out of it.