Ten times longer the first time than the tenth time
AKA, the first time doing any thing automotive for a novice is always harder.
All the Mopar cars made since 1962 up to 1974 need to have the center steering link between the pitman arm and the idler arm removed to get the oil pan off, you will probably need to loosen up all the main caps to remove the upper seal also
I would plan on 3 to 5 hours start to finish, maybe longer on the first time if you have all the tools you need