There's no better sign of your love for a classic movie franchise than gathering some friends, amassing an unhealthy supply of snacks and camping out in your living room as you tackle the entire series in one relentless go.
The bonding experience of revisiting one of your favourite movie series with friends can't be undervalued, nor the collective, cathartic pleasure of suffering through a franchise's excruciating low-points together. While a few of these marathons can be comfortably completed with an early-afternoon start, most of them are true, stamina-draining tests of how passionate your fandom truly is.
Can you fight off intensifying tiredness and the sheer mental exhaustion of watching sequel after sequel even as your body craves some other kind of simulation (if not sleep)?
10. Jurassic Park - 600 Minutes
The Films: Jurassic Park, The Lost World: Jurassic Park, Jurassic Park III, Jurassic World and Jurassic World: Fallen Kingdom.
How Long?: 10 hours exactly.
Why You Have To Try It: Though it's fair to say that only Steven Spielberg's original Jurassic Park is actually much good, the shameless B-movie tawdriness of the four sequels can make for a fun marathon, especially if you've got a group of enthusiastic pals to join you and possibly some alcohol to go around.
At "only" 10 hours in length, it's a positive walk in the park compared to some of the later entries on this list, largely thanks to the oddly short third movie, which clocks in at a merciful 92 minutes.
None of the movies feel excessively long, though the series' increasing reliance on nostalgia and lazy callbacks in recent entries will definitely prove tiresome long before those ten hours are up.