It shouldn't take 4 hrs to wire 3 ballasts 8' off the ground.
Pick up three ballasts from shop drive to job 1 hour...
Park, load cart, ladder, and bicker with some security guard who is on a power trip and won't allow you in the building - 1 hour...
Break time....
Repeat step two...
Do the actual work - while dodging irriate over-wieght women who think you are invading thier work place and need to manage you every move - and call a meeting to let you shut off the lights for 5 minitues on a bright sunny day next to a window - if for nothing else - COMPLETE BORDOM!
Lunch time....
Clean up and pack out...
4-5 hours.... If you clear access and other crap out of the way 15 - 20 minutes if you have the ballasts at the job and sparky at the door.