After someone on Lemmy recommended Dwarf Eats Mountain (it's okay), I checked out the idle game genre for the first time.

On one extreme, Magic Archery was completed in under an hour and all seven achievements were earned during normal gameplay.

But most other idle games, ho boy. They tend to have several hundred achievements, many of which would take literal weeks if not months to achieve, and often require resetting the game back to the start dozens of times due to prestige mechanics that are necessary for late-game progression.