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Each straight track is 16 studs, or 5". Four curved tracks are approximately 13.5" in length and height (16 curved tracks make a 27" diameter circle).
For this layout, the bottom portion of the track is 4 curved, 8 straight, and 4 curved, or 67". The left side of the track is 4 curved, 8 straight (two of those being the switch track) and 4 curved, or 67".
Assuming you wouldn't need the adjusted lengths for the upper right corner, your layout would be approximately 67" x 67".
Now that I look closely, is IS closer to a square than a rectangle.