Well I took a look at at a pool, it seemed to be doing 33 out of 120 blocks lets call it a quarter of the blocks, each block taking 2 hours and 6 minutes, lets call it 2  hours... 2 divided by 4 equals 1/2 an hour..

Now the block chain retargets every 5040 blocks, and its at 57724 so the next retarget is at 60480, or in 2756 blocks..

2576 X .5 = 1328 hours, /24 gives us 57.41 days.

1000 m/h gives us about 42 coins X 0.00096 BTC (current exchange rate) gives us .04032 BTC per day so I doubt the hashrate will increase, in fact it may decrease giving us longer per block so I guess the answer is..

At least 2 months possibly 4 months or longer...

No wonder the network stats are no longer made public...