Almost Reached The Ceiling.

Assuming a room

With a standard eight foot (8') CEILING,

With a length of  5 miles (26,400 feet) 
And a width slightly over 6 miles (31,719.19 feet)

Which equals an area of 837,387,084.70 Square Feet (sf)

Filled almost to the ceiling (7.999 feet)

With crisp dollar bills (.0043 inches thick)

Perfectly stacked with no air space,

Would amount to our current National Debt of 

$14,000,000,000,000.
How much longer will it take
To reach the ceiling?