Is there a limit of books received in a certain time frame or per mail package?
Most facilities have rules regarding books. Some have no limit, others do not. The most prevailing arrangement is that they allow an inmate to receive as many books as they want, but they must store the majority of them in the facility library. Storage is not plentiful in the living quarters but they encourage reading and self-improvement. Books and education are the best "escapes" for an inmate.