i love how jerry thinks this is 'impossible'. i did it with not too much difficulty, probably 85 is the limit. (btw i use the horizontal numbers above qwertyuiop)
Good lord. Took me 22 times but I finally got all 70. I used my left hand on the top numbers on the keyboard and the right hand on the numpad. It's still very hard like that and when I finally went quickly AND made no mistakes, I only had 2 seconds left.