What's the longest? (I don't need to know fastest because those are speed runs)

Some people spend thousands of hours to get through the game, and some people speed run them. On average though, I'd say, if you JUST did the Main Quests (nothing extra at all), the Morrowind MQ would take maybe 15-20 hours? Tribunal maybe another 10? Bloodmoon maybe another 15? That's just the barebones quests, no side quests, no other guilds, but taking the time to read everything and understand the lore. I'm guessing here because I take forever to do these things.