I haven't kept track religiously. But I can estimate.
I got him when he was first offered to me, which was within 2 days of launch, and have been farming his missions daily since. I'm currently 56/65 to 5*, he unlocked at 3*, so I have gotten 86 shards (one was a GW freebie). It's been about 40 days, but I have also refreshed his nodes about 8 times. So 85 shards in 48 sets of 6 tries, or a little below 30%.
I try not to be stubborn so I will admit that this surprises me, as I would have figured it was substantially lower than that. Unless I've done my math wrong. Or maybe they made a change at some point. To average near 1/3 I would need a lot of 2/3 to balance out all the 0/3 I get, and the 0/3 are quite frequent. The 2/3 are not.
With unlocking extra tries on both his nodes I should be averaging 4 shards per day if it's really 1/3, and I most certainly have not be. 4/12 is the BEST I have done. I'm afraid to even try the unlock today.
