This phrase is used by people who want time to move quickly, so they may move on with their lives, ala prison release, military discharge, school graduation...
The inmate said "3 weeks until I flatten this time, so Hurry Sundown!"
Sundowning is a term used to describe a decline in cognitive abilities toward the late afternoon or evening. It is a common pattern in senile dementia.
Poor Grandma tends towards sundowning around dusk; she's fairly alert in the morning but gets more confused in the evening.
Big bald guy has 6 shields on his back and 2 blades for him to use, could also use to make into one scrissor blade, this boss fight is pretty tought though...