We just installed one on our R-72 this summer. It wasn't too bad to install...we removed return elevator conveyor also loosened slid jackshaft that drives clean grain etc... (three pulleys on it) to the right as far as we could. This enabled us to install the "kit" as a whole. Maybe there is a easier way, but thats the gist of what we did. As far as how long it took. Can't give you a decent estimate...we bought ours used and it needed to be rebuilt and had some missing peices so that kinda drug it out. Our dealer would have sold us new one for something like $1,700. From what the neighbors say it is well worth the money, we'll see in a couple of weeks.