Chipper Jinma 8" Chipper - first hours

[newbury]

Thanks, yes they are double sided and I have an extra set but I was wondering how many hours of chipping should I get before I need to check? And how sharp is sharp?

thanks

Found an approximate answer from Woodmax

A-The WoodMaxx WM series chippers are shipped with USA made A8 tool steel
knives installed. This is the highest quality material you can use for a chipper
knife. That being said, there are a few factors that come into play here. If you
have 50 HP and are chipping clean green material, you can expect to get 50-100
hours of chipping