I estimated he was 36% done. So maybe another 4 months of dumping.
He's currently working on block 6539.
If you list all the initial distribution CLAMs in reverse order of the block in which they were created, block 6539 is 27% of the way through.
I don't know of a better way to estimate how far through he is.
You made me have to look at the blockchain...

First block was 733 and last was 8995 So there were 8262 blocks with clammettes. So 8995-6539 means he's been through 2456 block already. 2456/8262 = .2972
My initial assumption was we started at block 1000 and went to block 10000.
Of course even that is an estimate. No way of telling exactly how many rewards per block he will get.
Also some of the blocks in the 733-8995 range are not distribution blocks. I notice the last dig was blocks 6519 and 6521. Looking at 6520 it's only for 2 clams. Then I figured maybe we skipped every other block. 6518 is for 2 clams too. But 6517 is also 2 clams. So not just every other block.
Doog, I don't remember how you estimated his total, but I though you took into account some of the non-distributed clam blocks. I don't know if Xploited has the exact number of distribution blocks.
I also looked at a few of his transactions. I was looking to see if I could see a trend, of sending clams to poloniex. Several of the digs ended up in the same address with a total of 46.2 clams, or 10 rewards. Almost like he's grouping the clams for staking. Then there were other addresses that ended up with 4 or 9 clams. I couldn't find a pattern.