hello MnBobcat,
From my little experience so far with it, I have been using it for approximately 3-4 hours total. It varies with the type of wood and if it is dry or green. It self feeds nicely with evergreen branches recently cut I found, old dry wood have a tendency to kick back a bit from the blades and you have to keep pushing them back in. The adjustment from the blades (spacing from blades to the adjustable bar at the bottom) is pretty important. Mine was self feeding nicely until I threw a couple of root balls and a couple of small rocks were stuck in it. I had to re adjust the spacing to 1/32 inch between the rotor and stationary blades.
Gyro