So first you need to set a goal of how many or how much money you will save in Bitcoin in your portfolio. If you go ahead like that, it will be much better for you.[/b]
I understand the point you are trying to make her but I feels like the better target should be setting the numbers of bitcoin you wishes to accumulate in a particular timeframe than placing an amount
It's also impossible for you to be able to accumulate your targeted bitcoin quantity with a given time frame that you set in using to accumulate your bitcoin target. This is because life is full of uncertainty and inflation eats up the purchasing power of fiat while bitcoin price increases overtime.
For instance, if you plan to accumulate 2 in 10 years based on your own discretionary income. The price of bitcoin wouldn't remain the same for ten years which will affect the quantity of bitcoin that you are accumulating every week. You might be hit with some financial challenges that can lead to loss of job or lack of discretionary income to invest at a particular time.
If you don't look for other means to increase your income, your discretionary income might start becoming lesser overtime due to inflation and increase in monthly needs and expenses overtime and you might end up not having any discretionary income in future.
I feel that the best thing is to have a bitcoin target without a time frame provided that you don't have any health issues or you are already aged. This will give you the time to keep on accumulating till you reach your bitcoin target irrespective of the timeline. If you have reached your bitcoin target and you are still very strong and want to continue accumulating, you can increase your bitcoin target again till you reach over accumulation stage.