Not sure on the number of hours, but I started it last Wednesday. I had to figure out how to interface with ZBlade and Zune storage and what not, so a bit of time went into that as well as learning the general XNA 3.0 stuff. I work full time as a developer, so I've had to work around that.
You were fine putting it out there. I had a workable copy the day that ZAC was released, but I wanted to get a few more of the features in it first before I released it.


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