Banknotes normally last for 1 to 3 years.
a long time
A canadian school year can last about 6 years
a long time
Alcohol doesn't spoil
Depends on how you use it.
Styrofoam cups last in the landfill for hundreds of years. Paper cups break down much faster. Paper would only last for a month.
its about a 5 year warranty
As long as you don't wet the spot with the ink with any water.
About 2-3 meters
In cold regions m9 paper lasts on average 12 months.
The answer depends on a variety of variables, but the simplest is that barring further action on the pencil mark (rubbing, wear, etc), it will last as long as the paper.