It is not time bonus but power-remain bonus.(posted 9205 days ago)you can get power when enclosing seed(1),seeding(5),flower(25) and fruits(40).
It always decreasing gradually.and if it become zero,you will die.
If it over 100,you can not killed until it will be under 80.
you clear with 80+ power, your remain power become score.
I hope my poor english can teach to teen...