Question on length?

I'm starting my crappie condos now but my question is how long should the PVC be? I'm putting it in a 3 gallon pot with cement in the pot. The PVC I have is 10 feet long but was thinking about cutting it down to maybe 6 feet in length. I'm also going to mix 2 or 3 pieces of 1X2 boards in with the PVC hoping to get the fish in quicker.

I know its getting late to start but I got in a fight with a table saw some time back and lost part of two fingers. Just now getting to where I can do something. Any pointers would be appreciated.

sorry about the saw, I was using mine today.
Mind telling how it happened?

Just stupid on my part. Thought I was in a hurry and didn't use a push board.

It it were me. And the PVC was 10 ft half it. That is what I did with mine.
Also the Table saw does get hungry, And you have to watch it. I will not use mine without a push block.
Pete