cex.io how long can i mine with my GHS ?

[therealbigcoin]

Despite all warnings i buyed 1.43 GHS on cex.io with namecoins.
I mined 0.000594 btc in the first hours.
Now my question: How long is it guaranted to mine on this site? and what would happen if the website goes down?
I think after one year i have the money in and could sell my ghs or hold it forever 
Yeah maybe to hold bitcoin will bring me more BTC but the day will come and i mined More as i invested and then i can sell my ghs for profit or keep mining and get more milibitcoins but i dont have a loss. Or is there a failure in my thinking? 
Greetings

[1701170296]

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[1701170296]

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[1701170296]

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[1701170296]

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[b0ss]

As long as they don't go out of business you have your GH/s.
That could be 2 months or 20 years.

Remember the GH/s price will go down exponentially after time because hardware gets better exponentially.
So I think in the long run you'll lose money. It's only good for day trading if you ask me, not as investment.