It depends on how much you watch a day. Watch 10 hours of it a day mean you can get through 3650 hours of content in a year if you watch everyday. So, you probably could easily watch all of it. It would just take some time.
Also, you'd probably only watch stuff you're interested it. Maybe someone doesn't like MCU, so they don't watch any of that, taking away certain content. Or maybe don't like the old Disney cartoons. Or don't want to watch stuff they have seen already.
So, it depends on the person, how much time they have or dedicate to it, and what they actually want to watch and stuff...
Also, disappointed no "Fillmore!" at launch...
Easily!? Do you ever work!? Or do you just spend all day watching while you work? Otherwise 18 hours, if you watch for 10 hours and work for 8, leaves 6 hours for sleeping and transportation to and from work, not to mention securing food and eating it.
Also, this list is from the Netherlands, so its possible that some content changes will be made for the US version. ---
Que sera, sera. Whatever happens, happens. ...and he was never heard from again.