Do you have a Tormek?
Yes but I tend to use it for grinding the primary bevel once the secondary bevel has got too big.
Also it's no good for lapping the rear of the chisel.
Forgot you would be flattening the backs. I've had some take forever, the massive Hulatfors ones I have took a long time.
@Bobbo started
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Do you have a Tormek?