Well this last time I did the challenger I did it in steps. For example, washed the car/engine and such. But did something different for the polishing part. I did the car one panel at a time. Basically, I would clay a body panel, then SHR, then FMP. Not only can you focus more on that one section, I think I did a better job. You also save energy this way. If I clayed the whole car I'd be dead after that then would have to polish. After you do this, wax the car. Waxing is the only thing I saved for the end.
You also have the luxury of a second car, so idk what the problem is. Oh and you have a bike.