How would laws and justice systems need to change? What about crime and punishment if a life sentence truly means forever?

A life sentence WITHOUT the possibility of being commuted​ would be the harshest punishment. The death sentence would be in second place, followed by a life sentence WITH the possibility of being commuted

What hobbies, skills, or knowledge would you pursue if you had forever to master them?

I will try my best to learn many kinds of different foreign languages

These are the answers for "The Graham's Number Challenge"

How does knowing your life has an end (even after Graham's number of years) change your plans compared to true immortality?

I think the "normal" days wouldn't have any changes, I wouldn't change my plans about the skills I would learn

It would only change the viewing point to watch my "normal" days

Compare the two scenarios: After thinking about both, which one would you prefer: true immortality or a Graham's number-year lifespan? Explain your choice.

To be honest I don't want to live for a long time very much. So I will choose my normal life, neither immortality nor Graham's number-year lifespan

Key Difference: What is the most significant difference between the two, in your opinion? Is it the concept of an ending, no matter how distant?

Welp, I think the Graham's number-year lifespan will bring the certainty of "having an end", this will give me the comfort

The end of your life is so far away it's meaningless, but it will happen. Does this thought bring you comfort, or a different kind of anxiety compared to immortality?

More comfort than anxiety