You are cooking on a Traeger, so smoke it for a couple of hours at the lowest temp setting you have.
This helps a lot with the smoke flavor.
Then, crank it up to 275-300 to finish the cook.
Time? Probably 12 hours or so, but no way to accurately predict it.
Just plan on getting it done 3-4 hours early and do the cooler thing to hold and let it get happy.
Also, on beef use the strongest pellet you have available.
I start with a gallon or so of Blended Mesquite and let it change over to Hickory when the Mesquite is used up.
"Flirtin' with Disaster" BBQ Team (RETIRED)
FBA and KCBS Cook and Judge.
Former owner of a WSM, a Smokey Joe, a Charbroil Commercial gasser (junk), the legendary "StudeDera", a FEC100, a Fast Eddy PG500, and Sherman the Wonder Trailer.
Now cooking with a Yoder YS640
Proud Pellet guy cooking on real wood.