That should be more than enough time. The install is relatively simple pending you have the right tools. At a shop with a lift, they should be able to breeze through it. The most difficult part is disassembling/reassembling the front struts. The rear shouldn't take but about 30-45 minutes. When I installed my level kit, I had an extra set of hands helping me and we were done in three hours. This is with a floor jack and jackstands crawling around on the ground. I didn't have to disassemble the strut assembly, but a shop will have the tools to make that easy.