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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.
The truth is that you can't just keep accumulating , you will definitely have a goal something like an accumulation goal. And is still possible to buy once in a while after reaching that goal it all boils down to you and what is best for you at that time . Imo having a particular timeline as your target is some how , is best you have a fixed amount of bitcoin as your target because you might give yourself 5 years and still haven't gotten far with your accumulation. So for instance your goal is 2 BTC , so your target will be that two if you don't later have a change of plan, so having that goal will definitely help you being more serious and more aggressive with your investment when accumulating.