Q1: how much power max to drive? 

A1: It is 32 low impedance that makes more devices fit it. Compatible with virtually every audio device including phones, tablets and computers. Q2: It will be very uncomfortable wearing this headphone for a long time? 

A2: The headphone is not heavy and the earpads are quite soft, I wore them to listen to music for more than an hour and I did not feel discomfort.