I heard a song posted by someone which was just under 6 minutes long. Lets see if this song works, its 5.5 minutes
[v]14287.60567[/v]
didn’t work 
can anyone plz explain?
I had the same problem. It seems that I can never post any audio if it's more than 3.00 minutes.
in my case 4.5 minutes seems to be the limit