Usually yes - at least they do here in the UK ! When you borrow a book from a library, you are getting it for a fixed time. If you need it longer, you simply contact the library before the return...
No. But what will be charged on a late fee, will be reflected on something known as your your finance charges. Finance charges will go up if you are late making a payment on your credit card.
If unreasonable contact a rental association or an attorney. Amount is determined by the landlord. Not aware of any law regulating the dollar amount.Good luck.