How long does C2DM registration take [closed]

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I signed up with C2DM with Google. How long does it take for them to get back to you with your registration id?

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It's fairly instant. Both times I've registered it was less than 10 minutes to get an email back with the registration information.

Definitely take a look at C2DM example code when you start implementing. There are a few projects out there that make it a little bit less painful to use (they already implement things like exponential back off on retries, etc).