What's the standard duration for turnstile page animation on Windows Phone?

I'm displaying a control that pretends to be a page, and I'm wondering how long my turnstile-type transition should take 开发者_开发技巧so that it fits in with the rest of the system. How long do normal turnstile page transitions take?

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You can view the Storyboard for the Turnstile transition in the Toolkit on Codeplex, here's TurnstileForwardIn.xaml.

From a quick glance it looks like 350ms.