I was wondering if anyone is using
https://www.kncminer.com/products/neptune. Someone told me that it mines 2 BTC a day and breaks even in 2-3 weeks?
Anyone using this?
Also, what is the waiting time for this product after ordering (I reckon a year given the backlog orders)
This product is in pre-order and is expected Q1/Q2 next year. Nobody is mining with it.
If it arrives around April next year at a difficulty of 5000m then it would mine about .3 bitcoins per day.
I think you might have the numbers wrong.

If the Neptune comes with the minimum 3TH/s hashing rate my numbers shows with a difficulty of 5700090707 in April (30% increment from now until 25 weeks later) you will still be able to make 1.85281 a week or 0.2646871 a day!

Let's hope Knc is able to get the hashing rate higher before they release the Neptune B1 and B2 units.

This is a great site for figuring that stuff out.
http://btcinvest.net/en/bitcoin-mining-profit-calculator.php