How big is 600000 sq feet?

It's an area of exactly 600,000 square feet. How 'big' it is depends on how it's shaped.

-- If it's a square, then each side of the square is about 775 feet long.

-- If it's a circle, then the diameter (distance across) of the circle is about 874 feet.

-- If it's a rectangle 1 foot wide, then it's about 114 miles long.

It all depends on the shape.