for Feb - 5 delivery it will take 111 days to get your money back .
Notice that by the time you check how many days it will take to ROI you will see a different data because this calculator stays current with bitcoin exchange rate and bitcoin network hash rate . It updates new data every minute.
*when you will get your miner is the biggest unknown * remember to change the delivery date (up to 90 days ) to late or early so you can understand more about your risk . You also have risk with bitcoin network difficulty and this calculator based future prediction on past developments ( average of last 15 difficulty increments ) and you can also input your own data . You also have exchange rate risk and this calculator is using the current exchange rate but remember to change it up and down to see your risk .
Below is a link to feb-5 delivery detail calculations.
* Don't trust any calculator if it is not update data every minute . A true calculator don't just give you a yes or no answer . It should help you understand risk ! *