Not really, because that means he went 12 hours without: eating, sleeping, drinking, pissing, shitting, etc. Which means he lies.
You can eat and play at the same time, and you can drink coffee and stay awake. Also, before the 12 hour period, if you don't have much to eat/drink, you wouldn't need to use the bathroom, resulting in playing 12 hours straight.
In the end, it's not going to matter how many breaths you took, but how many moments took your breath away.