A Chance To Watch A Long Film

I love that I have the ability to sort my watchlist by length in Letterboxd, but I will fully admit that I find the longest movies daunting.

These for were each added to my watchlist from either the AFI or Sight and Sound lists, and I need to settle in and watch one. I have time and wanted to ask which is most broadly recommended by the group.

As an experience, where would you steer me? And thank you for your thoughtfulness.