How far should the clutch release on a 2002 4.0L?

I'm not talking about the components inside the cab of the truck, I'm actually talking about the clutch bearing release travel in the transmission.

I believe there is air in the system and I am trying to diagnose it before I try to bleed the master/clutch.

I'm getting about 1/4 inch release on my clutch and I dont think its enough.

Here is a link to a video thats explaining what I am talking about. Fast forward to 1:50 seconds.

 

Bump... someones got to know or can go measure for me. It takes two minutes if you have a helper... anyone can press a clutch.

 

Bump

 

It should release, you know.
All the way.
in serious terms, I think what the Video says is right, is there any issue in like the pedal or grinding gears? whats causing you to think there is air in the line?

 

5/16" slave travel