Just got a payment of .01013789 and I just started this morning, so it was probably for 18 hours of mining on 2.1 mh/s
If it doesn't pick up then I'm going to go back to mining LTC- I would have ended up with .02 BTC through just mining that over a day.
Hopefully it will level out and improve.
Strange, my payout was in ~23h mining with 1,5mH/s 0.0185 BTC. Didnt check how much the unexchanged was.
So im sure you can reach more than this .02 BTC with your 2,1 mH/s in an 24h run.