How long are LORs active?

<p>I'm a 3rd year planning on getting my LORs by the end of this current school year. Seeing as I won't apply for law school until I'm a senior in November, do I still ask my recommenders to send my LOR directly to LSAC right now? Does LSAC hold the letters until I need them to make a copy and send it to schools for me later on?</p>