i might not totally agree with you that while investing in bitcoin you should just set up a plan of accumulating 2 bitcoin and use the whole of your life in getting to that planned figure. setting an 8 or ten years plan will make things a bit clearer so you are able to accumulate your bitcoin realistically and not have to remain accumulating for too long. note that it is not by how long you have been accumulating bitcoin that really matters, if you can use less number of years in reaching your goal, it will be better than DCAing so small an amount such that it will take you too long too reach your goal.
It has to depend on the targets that each person has for their Bitcoin holdings. As you know, individuals who are using the DCA method to accumulate Bitcoin do not all have the same source of income. We will not have the same amount of Bitcoin since we are making more money than one another. Some people set their goals based on their earnings, they plan to purchase Bitcoin using the DCA method and use the amount as the target number of Bitcoin they wish to hold. For instance, if some investors accumulate Bitcoin and get to one Bitcoin, they stop because that was the initial intention.
However, using the DCA method doesn't mean that you should only invest small amounts of money for accumulating Bitcoin, it also tells you to continue buying with as much as you can afford, which will not affect your other expenses. So it relies on how long an investor wishes to keep making purchases five years or more.