A：By the way, how many books am I allowed to check out?
顺便问一下，我一次可以借出几本书?
B：You can check out two books at a time.
一次两本。
A：How long can I keep the books?
我可以借多长时间?
B：For two weeks. After that you must renew the books if you wish to keep them longer.
两周，如果你想要借更长时间的话，你得续借。