A long (or large) does a man’s penis have to be for you to consider him hung?
Do you mean decently hung, or very hung?
On the proviso that I’m not a size queen, anyone bigger than myself.
9" or more and it must be really thick
About 6 inches longer than you, French Onion. Judging by that, I would say 7 inches? Longer if you are a girl. 
Now really, what’s average? 5-6 inches? Anything over that would be hung. Very hung would be even longer.
9 inches?
A standard sheet of paper is only 8 1/2" x 11". How many guys are longer than a sheet of paper is wide?
I would estimate that a 9" penis would put a man well into the 99th percentile.
Lets see…
If he goes to the bathroom and yelps “wow, that water is cold”.
If he has to fold it into thirds to fit it into his underpants.
If XXXL underwear is too tight.
If a female sees it and runs shrieking in horror mumbling incoherently something about Cockzilla (sorry, forget who used that on this board).
If he was ever in a documentary with “elephant man” in the title…
Margo
… And deep.
Cockzilla was quoted from Gobear I believe.
frenchOnion, meet Capt_Yellow or is no introduction necessary?
Moderator’s note:
Nope, an introduction would be redundant.
TVeblen,
for the SDMB