Common questions:
How much is the maintenance fee?Maintenance fee is USD 0.00028 per GH/s per day. Although the maintenance fee is fixed in USD, it will deduct from the daily payouts in BTC.
How long does the "Open-ended contract" last?The specific duration of an open-ended contract is variable and determined by three factors: The mining difficulty, the Bitcoin vs USD exchange rates and the maintenance fee.
When a contract becoming unprofitable, namely, the payouts can’t cover the maintenance fee, then the resulting daily payouts will be zero. After that, the contract will continue to mine for 30 days.
If the contract does not return to profitability in this 30 days period, that contract will be terminated.
How much hash power should I buy? Generally speaking, the Jet plan will be a good starter for you to try.
When will I break even?Because the payouts will be influenced by the mining difficulty and the Bitcoin vs USD exchange rates, it's hard to predict how long it takes for each plan to break even.
But you could use this site
https://bitcoinwisdom.com/bitcoin/difficulty to have a general sense of how long it takes to break even.