When an item is long overdue (30 days past the due date), it's considered 'lost,' and your library account is billed a replacement fee and temporarily suspended from borrowing other physical items. 

As soon as the missing overdue item is returned and checked in, the fee will disappear and you can borrow again. It usually takes about 1-2 days for a returned item to go through the check-in routine.

Read more about fees & charges