5 drops. I believe the drops are every 3 1/2 hours. Sadly, I don't think I'll want to play as much from now on and my progress towards WFA will be much slower.
So far, in this thread we have:
21 commanders won
5 old commanders, rest WFA
So the odds so far are in favor of WFA
Make that 18 commanders won, 12 WFA and 6 old.
I was being sarcastic about winning those 4 WFA commanders. I only won 1 old commander everybody had for free. Sorry.
This morning I got a drop in 1, maybe 2 hours. Im thinking you can get a drop every hour but its a really small chance. Every hour your chances for a drop will increase, same for multiple drops I believe.