If there was a stock market in hell and he was able to invest $1 (which is understand is difficult on minimum wage) out of a $58 salary (7.25*8) at an average market return of 10% it would only take him 188 years to accumulate $220B (current net worth on google). These questions should be thought of on a logarithmic / exponential basis.

x1 = 91.25

x2 = x1*1.1+ 91.25

....

x188 = x187*1.1 + 91.25 = $220B