Master cylinder bore: when do you throw in the towel?

How much pitting do you dare allow? I can see some pitting, pretty shallow,
after about 1 minute of honing per hole. Mainly on the "clutch side", between
the opening of the bore to the hole into the reservoir. Does it have to be
perfect, or only if you're a perfectionist? Yes, I realize it's "only" my
brake system. Can I hone on it longer than that?
Dan