What happens if remove( ) is never invoked on a session bean (EJB)

Question :What happens if remove( ) is never invoked on a session bean? (EJB)
Answer :In case of a stateless session bean it may not matter if we call or not as
in both cases nothing is done. The number of beans in cache is managed
by the container.
In case of stateful session bean, the bean may be kept in cache till either
the session times out, in which case the bean is removed or when there is
a requirement for memory in which case the data is cached and the bean is
sent to free pool.