About 0.43 inches of space is taken up by a stack of 100 dollar bills. Every paper bill in the US is 0.0043 inches thick, which means that 100 bills add up to 0.43 inches.
Each bill is also 2.61 inches long and 6.41 inches wide, which makes its square area 16.7301 square inches. Before 1929, bills were 3.125 inches wide and 7.4218 inches long. Since 1929, bills have been this size.
Most $100 bills stay in circulation longer than bills with lower values because they are used less often. For example, most $100 bills stay in circulation for about nine years, but a $1 bill only lasts about a year and a half.