well.. we said 11.. but getting there at 9:30 or 10am wouldnt hurt. there are 3 lifts we can use... but we try to only use 2 lifts at a time and keep the 3rd bay for the easy stuff stuff depending on weather.. being it too hot.. or like last time.. snow. 7 hours is a lot of time.. and last time we installed a rock krawler 2.5" max travel kit in an hour and 15 minutes without any issues. when I get there in the morning I set up my laptop and basically make a schedule of who is going into what bay according to what time people get there.. basically a first come first serve basis... and i try to spread it out so one of the mechanics isnt putting on all the lifts while the other ones are just doing brakes.. or things like that. Its kind of hard to plan.