My brother started The Irishman this AM. It is 3.5 hours long. I watched about an hour and half. It is amazing.
DeNiro was on Colbert, and he explained that Scorcese had Pesci and DeNiro go through scenes from Goodfellas so they could cue in the CGI to restore they could de-age them via CGI for the scenes over a 30 year period. DeNiro looks a little stiff when he walks, but otherwise it is not noticeable. Pacino has a good Hoffa, too. apparently, Scorcese has had this one in the works for 15 or so years, and initially they were going to cast other actors as the younger major characters until they hit on the de-aging.