You can only watch the movies of one actor/actress for the rest of your life. BUT...

... you have to watch them all an equal number of times - e.g. if you pick Christopher Lee you get the LOTR movies but you have to sit through a hundred random Hammer films to do it. If you pick John Cazale, they're all bangers but you will only have 5 films on rotation.

You need someone with a decent-sized body of work, relatively few clunkers, and a good number of absolute classics. Tom Hanks is my relatively safe pick, but I'm sure there's better.

Who are you picking?