Want to know, if I invest on Genesis-Mining about 1 BTC, how long I get the return of my investment?
Answer is that you will no longer get your investment back. You can't ROI with them, it's impossible with their fees and no one is recomending their website for cloud mining as you see other bitcointalk user's posts. In fact they are lying people and they are selling contracts knowing their customers won't ROI. It would be much better if you buy 1 btc and sell it when it's price will be up, it will give you better profit and you know that you won't lost your 1 btc despite genesis mining.
Also read this thread carefully, it's about their scam alert:
https://bitcointalk.org/index.php?topic=1185909.0