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Every investor must set a target timeline to which his/her investment journey would last actively before thinking of a possible sell, with this in mind, such an investor creates or build up funds such as emergency and reserve funds through his discretionary income to enable such investment plan been achieved. An investor who fails to plan, already plans to fail. A set plan of targeted goal towards such an investment will serve as guide and road map to a successful Bitcoin accumulation process..
I largely agree with you that setting a target while investing in bitcoin is cool, but I don't prefer using timeframe to set a target in my accumulation because you might not be motivated to accumulate as much as possible, since you don't have a specific figure in mind, but if you have a target of accumulating like one Bitcoin or more in a specific timeframe, the enthusiasm and commitment will be there because he knows that he has to accumulate X unit of Bitcoin at a certain time, so their will be no room for complacency, and due to the fact that you has a target to meet, you will likely cut out any unnecessary expenses and channel that funds to your investment, so what am trying to say is that it is more better to set your target on achieving X number of btc at a certain time, than just investing with the intention of accumulating till a period of ten years thereabouts.