I do my SLC ribs in just under 4 hours.   Trim the ribs and rub them down.   We like our food a little spicy, so I found the following rub mixture:
•    2 tablespoons paprika
•    1 teaspoon freshly cracked black pepper
•    1 tablespoon brown sugar
•    1 teaspoon kosher salt
•    1/2 teaspoon celery seed
•    2 teaspoons of Cajun seasoning (like Slap Ya Mama), or to taste 
•    1/4 teaspoon garlic powder
•    1/2 teaspoon dry mustard
•    1/2 teaspoon cumin
While those set up, I get the WSM going.   I use KBB and a little Apple  or Cherry wood.   She likes to run around 270* - 280*, so that works for  me.   Once she starts burning TBS, I throw the ribs on.
If I throw them on at 12, I don't touch the smoker again until 2.   At  that time, if I am going to wrap, I will grab them off, take them  inside, wrap, and return them to the grill.   At 3, I will grab them  off, take them inside, unwrap, and throw them back on.   I start  checking for bendy around 3:30 - 3:45.   They are usually done before 4.   
If I am not going to wrap, it is pretty much the same, but I start checking them a little sooner.    Either way makes great ribs, juicy, with a slight pull, but pulls clean off the bone.