Keep your logs as long as you want but in actuality you are only required to produce the prior 7 days as a driver. I used the 6 months the carrier is required simply because it works if you have your own authority etc. and 6 old books are nothing to keep. I don't really want 84 or more old books laying around though.t's been a little over three years since my wife and I had to come in off the road, and in doing some cleaning before moving we started wondering if there was any legal reason to keep our old log books.