Goal Zone Size

I’m aware that the goal zone is ~25 feet wide, but how long is it? The tape is placed at the end of the low goal, but what dimension is it?

http://www.usfirst.org/sites/default/files/uploadedImages/Robotics_Programs/FRC/Game_and_Season__Info/2014/Game_Specific_Field_Drawings_Low_Goal_2014.1.4.pdf--best view is on page 4.

Or you could look at Section 2.2.3 for an approximate answer. (Warning–about 1’ short of what the drawing indicates.)