amount of adrenalin that freddie had per life

i wonder how it feels for a man that went out on stage so many times before loads of people..everytime it was a rush of excitement and adrenaline..it should be something like coming back from war-you become fearless or smth.

How many lives did he have?

isn't per the same as 'during' in this case??
you know what i mean..

it would sounds if u had asked "amount of cocaine....)