Quote from: Nubminer on June 16, 2015, 12:41:16 PM

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but since the Difficulty changes every few days.. and the cost of electricity is also unstable and the price of bitcoin is not really stable either.. you may never really see any profit.

don't get me wrong it is still possible that things may improve in the price of bitcoin and you could make a profit.. but at least consider all options.

Just to clarify: Bitcoin mining difficulty adjusts after every 2016 blocks. That's supposed to take 14 days. If those 2016 blocks are mined in less than 14 days, then difficulty will increase to try and do the next 2016 blocks in 14 days. If the 2016 blocks take longer than 14 days, then difficulty will decrease, again to bring the next 2016 blocks in right at 14 days.

While it may feel like it's "every few days", it's actually block count based and not time based. If you scroll down a bit on the following page, you can see some past difficulty adjustments and such. Makes for interesting context.

https://bitcoinwisdom.com/bitcoin/difficulty