Calculating Income: futures contract costs $8K; need $500/wk

[BrandonLG83]

Hi, not sure if this is a calculus questions but I'm sure you guys are smart enough either way. I'm looking for a formula to help me calculate my projected returns from day trading. I'll illustrate with an arbitrary example:

A futures contract costs $8000. For every futures contract I have I can make 500 per week. I roll all of my profits back into my account at the end of each week. How long will it take me to make $10,000 per week? My initial investment is $8000

Thanks in advance!

Brandon