when you say the whole car, what do you mean? the whole trunk?
the trunk should take about 30 minutes to install, the drying of the adhesive is what takes a little while.
i was planning on having my doors done also to reduce hwy noise from the tires. the rex has almost no sound dampening (what do you want for 25K right?) so i think it will make the car a lot more pleasant to drive on the longer road trips. each door shouldn't take more than 40 mins. (take the panel off, cut the foam, fit it and secure it, then redo the panel.)