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or it could be months? There is strong speculation that the Saudi's kicked off the price rout to kill off US shale suppliers weaning the US off their dependence on Saudi oil. The way shale works is that you drill a well....it lasts a few months and then you have to drill another well....you require constant capital expenditure......its not like conventional oil where you spend capex once to build the well or rig and then only spend maintainance capex.......the average cost of production for US shale is estimated be around $50. Many of those players are going to go bankrupt this year....already 34 went bankrupt last year ( refer to the article below...). i reckon once the saudi's have taken them out....they will let the price go back up.....already its a good sign that they have started to work with venezuella and russia.....the new opec will be a far stronger cartel . Patience!

http://www.theguardian.com/business/2016/feb/20/oil-and-gas-producers-distress-low-prices-bankruptcy