Excalibur 9tray dehydrator?

Okay about ready to break out the old dehydrator and was wondering if anyone else has one of thees. If I remember right last year took me right at 7 hours to do my meat. But last time I was doing sliced meat and this time I'm doing burger. So was wondering if someone could answer me a few questions. I would think that burger would dry faster so if someone has this machine could they maybe tell what they think? And how much would I be able to do at one time. I'm thinking I'm going to start this Saturday morning before I go out and then run a second batch before I go to the IU game. So planning to run two batches and was wondering how much I should plan for. Do you think I could do 8-10 pounds each time? Like I said going to have to be someone that has this machine. So just taking a stab in the dark that someone does and knows.. Thanks guys..
BB