We do have some short 2 month plans, or are you looking for even shorter?
My apologies, I only looked at the front page, It's a little hard not to purchase 12months when 6months on 10ghs is only $12 less,
When it comes to mining, efficiency is all about getting your hashing done quickly before the difficulty rises too fast. With our flexible contracts we will be allowing customers to buy additional GH per month on a monthly basis. So if you are 3 months into a 4 month contract and want to increase your power in the final month, you'll be able to do so for a very favourable rate - this is the major benefit to the flexible contracts.
On a fixed term 12 contract, you get the same power for the whole term, no changes. Your mining returns will obviously be much lower toward the tail end of the contract, hence the price for those later months is much much lower, but what it gives you is simplicity.