Technically It would take an infinite amount of time. But to be counted as nothing with existing plugins it would take about 145000 time. I did do my math wrong :D
Better idea, whats the percentage?
Realize, you couldn't do that. Say you had 100000. You lose 10%. 90000. You lose another 10%. 81000. 72900. 65610. 59049. It would take over 65 million kills to take all of their money.
I agree with that like it would be way to easy to get money ther would be way too many exploits. Two people teamed killin eachother could get more money exponentially.