Frankly, none. But never bite the hand that feeds you I say, particularly when it feeds you ripe fruit and vegemite sandwiches. This rule applies doubly for evil galactic overlords between gigs.
(And yes, the first continent to be occupied by my approaching armada WILL be Australia.)
But I digress. What is the proper amount of blogging? I guess it depends. Do you have something else to do? If not, then the sky is the limit. Blog ’till your fingers bleed.
Do you have a large audience who can’t wait to hear what stunning, insightful (or incite-ful) and elegant prose you will produce next? Then at least once a day, I suppose.
What if you’ve got a very tiny audience?
Oh, you sad and pathetic human.