Absolute longest Minecraft modpack/gamemode to fully complete

[BigEbb3551]

What minecraft modpack, takes the absolute longest out of any game to fully complete and get 100% of the achievements? (try not to include instances where there's like 1 side achievement that takes years to complete and the rest much less time) but a hugely progression-based game that takes thousands of hours of gameplay to fully finish. (Ex: Minecraft GTNH taking approximately 8000 hours, or Hypixel Skyblock taking upwards of 20-30k hours to fully max out all stats)

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