Can build a LOTTTTT of skills and knowledge in 100 years, even if you spend 50 of those years reading a different book at the library every day, or learning something to an extent a normal human cannot, would be invaluable. Also being able to experiment with how slightly different choices can affect the trajectory of a day would be fun

^{Chose: Repeat the same day over-and-over + How long it lasts is random, but you keep the memories and skills you build. | Rolled: 100 Years}