How long would it take if you fell into the mariana trench?

I found this topic to be interesting. the trench is over 7 miles down, and say it was drained out or something, and a 160 pound person fell into it. if you do the math right, you could proably get the right calculation. What's your estimate? I think it would take about 7 minutes to hit the bottom depending on the persons weight, because the heavier you are the faster gravity pulls you.