All depends, some cover half the width of the drum or disc, some full width. Some two, some four locations, on the drum.
Some big chippers may have more. Dunno. Bandit makes a 21-22" capacity machine. Lots of tree services have 12-18" capacity chippers.
To my knowledge, all chipper knives are single- bevel, except a very slight double bevel from
Bevel Buddy™ Chipper Knife Sharpener | Morbark Products - https://www.morbark.com/product/bevel-buddy-chipper-knife-sharpener/
Or
A touch-up tool...
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