I don't know if it relates to a number of posts or to a period of time. Hang in there, it shouldn't be very long.
I think the general rule of thumb is 3/4 capped but apparently you can have frames fully capped that are still too wet and conversely you can have frames that aren't capped at all which are at an acceptable moisture level. The best way to tell is by using a refractometer, I'm just looking in to these myself.
And welcome to the forum by the way.
Now what is a refractometer, is there a post about them?
I didn't extract last year as I wasn't game to be honest...I bumbled through a supering and when a friend checked said I did a good job, we nearly split it but thought better of it... decided better they have surplus...
When they got active this spring and actually swarmed ( I caught them ) we checked the top box and they'd nibbled away some comb - must have had to big a population or struggled to stay warm (we hit minus4 a few days straight!!! maybe both
The thought of robbing their honey scares the hell out of me.. I envisage a cloud of angry bees chasing me.. honey leaking everywhere, them breaking into where I'm spinning etc etc but the temptation to make mead is great