I did three batches of jerky last weekend and they took around 4.5-5 hours but that was ground meat out of a
jerky gun. Does yours have a fan that blows in it? Mine does and it gets the jerky done really fast compared to my dads old Ronco which didn't have a fan and it would take him almost 2 days to get all of it dry when he had a full load. Give it the bend test. If you bend it the meat should crack and look dry but it won't break in half. I bet its getting close. My directions sucked on my
dehydrator. It said it would take anywhere from 4-12 hours for jerky. That's a huge difference and I know there are a lot of variables (such as thickness and temp you use if you have a temp control) but come on they should be able to narrow it down a bit. Once you get your first batch done then you will have a better idea how long it will take in your machine.