one is you need to get into shape on how to optimally use the time
then you need to know how to wash and wax as quickly as possible
no need to spend hours after hours everytime you wash and wax
if you have 2 hours in total, you can very easily properly wash your car and appropriately wax it.
You really need to get this into your routine, as soon as you have couple of coats in couple of weeks, you will see you can do the same routine in one and a half hours.
so my advice is pace yourself properly and watch time, and don't spend more than you have to. Plus if you don't have time you may delay the interior detail for some other time and do the interior independently of the exterior.
Always remember, your car is not a show room car, its a daily driver, so maintain it that way, and don't push for a showroom detail everytime you want to wash your car.