auto to manual swap how hard? how many hours

I've done it several times on old chebs, it takes some time, probably 8 hours to remove all the parts and reinstall the new, that's after you have spent 4 hours removing them from the donor. The only real difference on the Mopar is you'll need to swap the entire pedal assy which is also the dash and column support, on a cheb you just changed the pedals. It's not a job most shops would take on and most would probably quote liability of altering the car from its original.
Its not really a hard job if you have the tools and some ability.