Propagating shrooms

[gab24m3]

I'm going to start a prop tank for my blue shrooms they are growing like wildfire in my 135. My question is... What is the healing time and growth rate when you cut em into slices?
Here is the mother colony
http://http://img379.imageshack.us/img379/6738/dscn0329pi0.jpg (http://imageshack.us)