question about AV mine supply

Regarding coldtooth mine for horde..
I've heard that the turn-in requirement is 280 and I've also heard it's 300. Which is it?
Also, in a perfect BG setup; how quickly can you gather up those supplies in order to summon the reavers?
I've heard that the turn-in requirement is 280 and I've also heard it's 300. Which is it?
Also, in a perfect BG setup; how quickly can you gather up those supplies in order to summon the reavers?