Adjusting cook time for smoking multiple items

They should cook pretty close to the same time. When I used a masterbuilt, I found whatever was on the top rack cooked quicker, but usually both finished within a hour of each other.

Thanks to you both.

I thought that was right, but I just wanted to be sure. Didn't want to budget for 7-8 hours and then get it going and realize I should have budgeted for 14.

Aside from the good tips already posted...

One recommendation I would consider is rotating the briskets during the cook, especially if they are on different levels in your smoker.

Most smokers don't distribute heat evenly, so one way to be sure to promote even cooking is to rotate your briskets halfway once or twice during the cooking process.

After about 4-6 hours, take the brisket that's on the lower rack of your smoker, give it a 180-degree turn (on a horizontal plane), and place it on the higher rack and take the brisket that's on the higher rack of your smoker, give it a 180-degree turn (again horizontally), and place it on the lower rack.

You can also do this by just removing the whole rack with the brisket still on it.

Then you can rotate again once you wrap them if you choose.