To be honest i haven't installed the drivers for it yet I will check the manual in a sec as for warranty its 3 years worldwide warranty although i've never had to use it yet for an asus product.
Not far at all as i didn't measure right and the monitor hasn't got enough room to fit under the top of my deskwoops lol. Just measured and i'm sitting 45-50 cm from the monitor atm everything looks perfect though at this resolution.