Did my first brisket (flat only) a little while back. 70 mins a pound is a good ave. but, it's done when it's done, as everyone says. Had mine in the cooler for about 3 hours before we were ready to eat and it was still hot and juicy. Post pics of the cook and finished Q.
NB Bandera with baffle, fire grate, and charcoal basket mods
Modded ECB with Rotisserie
Superfast splashproof Blue Thermapen
Camp Stove and Cast Iron Cookware
Branndair Uisage Beatha Cuallach