Theoretically, if the walls were perfectly reflective the light would never get absorbed by the walls. However, tiny dust and gas molecules would absorb the light, and then the light will eventually fade.
When you are in hell you are there forever.
I'm going to survive forever, so far, so good
until your air runs out or forever
a Siphon kills victims to survive or he/she live forever
Only if they are in an enclosed capsule with a life-support system.
Kind of like a cave. Probably forever.
Yes it can, but not forever. It can survive off of it till all the water in it is gone.
because their seeds are enclosed and protected
As long as your faith is in Jesus Christ you will live with Him in Heaven forever. You body will die but you soul will live forever.
Forever with proper attire and hydration.
A totally enclosed and controlled environment, with sufficient food, water and air for the duration of the visit
No, if you did, no one would survive the TV show "What Not To Wear". Seriously... no, demons are easier and more difficult than that to see.