[mvdgaag]

Assuming our goal is happyness (not individually, but for mankind).
If overall human happyness could be measured and positive happyness would be achieving the goal while negative would be failing to achieve this goal.
Than time*happyness enjoyed (or the surface under the happyness-time curve) would be the total amount of produced happyness...

If you think we should not be put out of our misery (so we are living more moments above the 0 line than below) there's clearly less enjoyed happyness when it stops in 500 years (although there is more happyness to enjoy during these years, except on the end?) compared to the thousands of years of being just a little happy.

If the goal is happyness for this generation, bring it on!