checked via debug, attack time is correct
Pet duration = 15s
attack time 1 = 2s - 10.6% = 1.79, 15 / 1.79 = 8.38 attacks
attack time 1 = 2s - 17.1% = 1.66, 15 / 1.66 = 9.03 attacks
but its true true if pet will make his first hit right after summon (i mean without time loses)