I would like to know which legit CloundMine site i can get investment back in six months. I only know CloundMine sites where you invest BTC and never more see your money back or only retrieve a part of it.
A legit site with 6 months investment return would be amazing, unfortunately i know no one.

To get your investment back in six months, you need to buy hash power in bulk, so that it comes cheap to you. Let's do a little bit of math here. According to
Mining Profit Calculator, 10 Ths create 0.8443905 BTC per month. Now, at
www.CloudMining.website, it costs 4 BTC to buy 10 Ths. So, within 5 months, your initial investment is recovered. Rest of the 7 months is pure profit for you.
Regarding legitimacy, you might verify their payment history since 2014 on the blockchain. All their payments so far are public and can be verified at
www.CloudMining.website/payments.php. Moreover, the screenshot below shows how a third party cloud mining monitor made ROI with
www.CloudMining.website within ~114 days in early 2015, when difficulty was far low...
http://anony.ws/i/2015/03/02/cmmonitor1.pngWhat ever you show are only in paper, as soon as you invest 4 btc within 1 month you account will get banned or problem will start and all your investment will be gone.