19 years (1935-54) including 5 years during WWII (1940-45) when work was suspended.
15
Groundhogs will build a burrow (an underground tunnel or tunnel system), where they sleep, hibernate, and raise their young.
10 years according to Homer's Iliad
Took more than 5 years to complete
25 years they want to build the Washington monument
It toke 8 years to build the Erie Canal.
It took 8 years to build the White House.
15 years in total
to many years to count
14
10 years
14 years