How fast does it take for an oak tree to grow?

to be fully grown it takes about 5 years. For one foot, well, you do the math

Who ever wrote the above knows nothing of oaks. They very wildly and much depends on the acorn's ability to set down a deep tap root. There are NO oaks that grow to fully grown (60-100 feet) in five years. An average moderate rate of growth is just over two feet a year, and that would take 10-15 years to get a nice sized tree.

I have BS in Ornamental Horticulture. The answer above is plain wrong.