Sure 2 guys for one days sounds good and that's how long it should take if everything works according to the plan. Two guys for 4 days sounds a bit on the high side unless everything that can possibly go wrong does go wrong.
The first variable is the two guys themselves. All electricians are not created equal. Are the two guys that are to do the work known hard workers or are they goof offs that are known for clock watching and will use any excuse to kill time? Will they be working with a hangover on Monday morning? Is it a long drive from the shop and they won't be able to start until say 10 AM because after getting there it takes another hour to just get inside? What if they get there and don't have everything needed on the truck?
