About 5 billion years.
The number depends. If we stop use of CFC's, it could even stop.
Eating an apple will add to your energy stores; riding a bike will deplete them.
It will not finish now. However if we curb the use of CFC's, it can be replenished.
if it was infrared light, which is basically heat, it would take about 10 mins. normal light would take about 8 mins at most.
100 years
I think you mean how long does it take for the earth to orbit Sun. The answer to the question I think you are asking is 365 days and 1/4.On the other hand, if you're asking "How long does it take energy from the sun to get to Earth ?",such as heat and light and stuff like that, the answer is 81/3minutes.
That would depend on which type and form of energy you are referring to. Light energy takes about 8 minutes to reach Earth from the Sun.
Which energy?
using the energy does not deplete the energy source
Just keep using it! If it will take too long, just put a movie on from iTunes (that will stop it falling asleep) and leave it. It will eventually run out.
Deplete, drain, empty, exhaust, spend, take, use, void.
Deplete, drain, or take out. Those words mean the opposite of pervaded.