You can renew a book that you have borrowed in the following ways,
Undergraduates & Postgraduates (Masters & Diplomas) can renew a book twice only, after the initial standard loan period.
Staff & Doctoral Postgraduates can renew a book up to 3 times.
Your return date may be shortened if a book is recalled by another user. The standard loan period is 6 weeks unless another library user requests the item. Once an item is recalled you are only guaranteed the item for 2 weeks from the check out date. You will receive a recall notice by email giving you a new due date. If you have already had the item for over 2 weeks you will be requested to return the item in 3 days.
You cannot renew Short Loan items (yellow sticker and U prefix).
You cannot renew a book if it has been recalled by another reader or a library staff member.