Sky, I'd suggest brushing up on the regs. A lot has changed in 10 years. That's one of the places I always start when a pilot hasn't flown in a long time. After that, the biggest thing I find when people haven't flown in a long time isn't the stick and rudder work. That seems to be much like riding a bicycle. It's the communications and avionics that give the most trouble. Being a 121 guy should help in that aspect as well. You really don't need the GPS and all that stuff but most people wanted to spend a little time with it. I hook up a powercart and give the demonstration on the ground so they aren't paying for the airplane too.
I find that a BFRs usually last about 3-4 hours total for me to be comfortable when the pilot had recent time. Most of that was on the ground.