re: Google Nexus 6 Preorder Info & Reviews
Not exactly. You can cancel anytime up until it ships and if you miss the window you can refuse delivery and they'll refund the card after receiving it back. Once you've received the device and accepted delivery you have 15 days to return it.
https://support.google.com/googleplay/answer/2423477?hl=en
https://support.google.com/googleplay/answer/2411741?hl=en
14 days from when you receive the device
Edit:15 days not 14
Not exactly. You can cancel anytime up until it ships and if you miss the window you can refuse delivery and they'll refund the card after receiving it back. Once you've received the device and accepted delivery you have 15 days to return it.
https://support.google.com/googleplay/answer/2423477?hl=en
https://support.google.com/googleplay/answer/2411741?hl=en