Agreed on the time frame - 1.5 to 2 hours. Back plugs, maybe an additional extension and universal. A little Anti Seize on the plug threads and a dab of Dielectric silicone in each plug boot. Considering it's a routine hemi tune up, pop in a new PCV valve and Air Filter while you're at it.
Also, doesn't hurt to clean the throttle body. Easiest way is to unbolt it (disconnect the wiring first), take it off and gently wipe the tarnish away using a soft cloth with Brake Kleen or Mopar Throttle Body cleaner. Use a Q-Tip for the tight areas. Avoid flopping the butterfly valve back and forth. Lightly blow with compressed air to ensure no fibers or dust remains. Bolt it back on and reconnect the wires. Indeed, patience required and overall take your time but it also can be fun tuning up the Hemi!