You should never have to spend anywhere near that amount of time on any reasonable vehicle.
First off you could shave any time you are spending claying a vehicle down to no more than 30 minutes using a paint decontamination system while at the same time getting superior results. Whats more you wont break a sweat.
Wheel acid avoid it unless you really know what you are doing. We see a huge number of vehicles come through the auctions for example where the wheels are damaged from acids. If you do use an acid based cleaner make sure it contains a buffered acid. They are safer for the user and the surface they are being applied to. I however never use them on wheels only use on boat hulls and glass. There are products that are very safe to use and in my opinion work better. I use one product on the tires wheels, wells engine etc. that is very safe.
There are jobs that you have to say no to because they are not more than a boobytrap of problems. Where you touch it and you see bare metal. They are beyond help. That said we have used the same basic steps on machines from $5k-$42,000,000 with exceptional results
Dont create work by trying to get through a job. Use good tools good products and your head and you will be successful.