New guy here from central New York. Been smoking for a couple months. Loving it. Have a propane smoker. Works well. I smoked a rack of ribs last weekend and they came out perfect. I use my own rub, made of salt, pepper, sugar and paprika. I did a single rack in 6 hours. I'm doing 4 racks tomorrow and wondering how much longer anyone thinks that would take. One rack was perfect in 6 hours. Any advise on 4 racks?? Thanks in advance. Been reading your info for a while. Just joined. Thanks again.