1st transaction take mins to confirm, 2nd takes hours, same desination, explain

[cunninlogic]

I pulled these both at 2:15 EST.   The first one had 6 confirms by the time the second one was sent.   Why does the second one take so long to confirm?   I've experienced this with other sites too.

Status: 14 confirmations, broadcast through 30 nodes
Date: 3/28/2013 12:34 EST
To: BTCe
Debit: -6.60 BTC
Transaction fee: -0.0005 BTC
Net amount: -6.6005 BTC
Transaction ID: 2ebab38790d872ebbbb025889799a7338ca1d9027600f46afd08f99163669f9e


Status: 0/unconfirmed, broadcast through 35 nodes
Date: 3/28/2013 12:49 EST
To: BTCe 1H15YuVcBQPUnADve3jArNtgqjrfPwp2Zj
Debit: -2.3995 BTC
Net amount: -2.3995 BTC
Transaction ID: 071f68a6a2bd328ca3579e192a7ae0309f65074a4eb23333de1fb06e2b7e68f2

[1714061882]

1714061882

[BRules]

the first transaction has a miner fee, the second don't, so it's a low priority transaction. it will take a while but it will confirm.