How long should one have to hold down the power button on a full charge?

[Ominous]

I have had my Nexus 7 since Thanksgiving. From the first day I have had to hold down the power button for 20-30 seconds to get it to boot. Is this normal?

Thanks.

 

[Groid]

I just hold the button for maybe up to 2 seconds, let go of the button, it turns on.