Have two 6 lb brisket flats. Need to cook both. Planning to bake in oven at 225*F. Each wrapped individually. Not touching. Cook for 6 hours? or cook for 12 hours?
Or wrap together with slight overlap and cook at 225*F for 12 hours ?
So right now, you're on the road to disaster.
Good that you asked.
1) You don't wrap to start off with. You wrap to get through the "stall" although some don't.
From 165* to finish takes a long time. Wrapping speeds it up. It's called the Texas Crutch. A helper.
2) You do not go by time, you go by internal temp while monitoring cooker temp as well.
You'll want a two channel temp monitor. Without one of these, it's a lot of monkeying around and guessing.
Electric ovens often lie, so you need one channel to monitor cooking temp.
To set bark, all you need is glue (cooking oil or similar), salt (Kosher is best) and pepper (18 mesh if you can find it)
Wrap at 165* internal with butcher paper (not coated !!!) or heavy foil (18")
I pulled my last one at 203* internal and it was great (some pull at 195*)
Wrap in towel and rest in cooler for 30 min.
Optional :
Inject with Kitchen Basics beef broth on a 1" grid