Answer

NYU New York:

Depending on your status (undergraduate student, graduate student, faculty, etc) books from the General Collection can be borrowed for 60-120 days.  For information on borrowing limits of items not in the general collection, take a look at our Loan Periods <http://library.nyu.edu/services/borrowing/nyu/loan-periods/> chart.

Please note that if your book is recalled by another user, you will be notified via email that you may keep your item for only two more weeks.

NYU Abu Dhabi:

Loan durations for books/Items from different collections vary, please check under Loan periods under Borrow & Request section of the website.

NYU Shanghai:
For NYUSH users, please refer to https://library.answers.nyu.edu/faq/434446