The amount will be based on your calculation and the total amount of you income so you will split all of your income in the right allocation.
Besides that, you will not have to use the emergency fund if you are not in the urgent situation that need money. You can keep your emergency fund in the right place while you can focus with your investment.
Part of your discretionary income is what you are to use in build your emergency funds and invest in bitcoin. If you allocate money from your income that's not your discretionary income to build your emergency funds, you will end up using your emergency funds to take care of your needs and any long term bitcoin investor without an emergency funds is only gambling.
That will not be a good way for start the Bitcoin investment because every time we buy Bitcoin will be end up to be used for our emergency needs. We will not accumulating more Bitcoin but it will just stay for a while in our wallet and then we use that amount to fill our urgent needs. Besides that, we don't know how many times our urgent needs come to us so we will not have a chance to accumulating more Bitcoin. That is why we must allocation our money with right to prevent the bad thing happen. We can search for the right info how to manage the income, all income we get so that will works good to our life.
Whichever way we want to do this doesn’t really matter as long as you have an income to start your Bitcoin investment with your discretionary income, and build a portfolio, But we must know that it is also necessary to have a plan for our emergency funds, whichever way it takes you to build your emergency funds it’s just important to have emergency funds for someone whose interest is to buy and hodl for a long term.
Having a discretionary fund after taking care of all our expenses that enables us to build our bitcoin assets either on weekly basis or monthly basis considering when we have a discretionary fund to help and accumulate Bitcoin consistently, we can’t just predict scenarios in life, which is why we can be building our emergency funds gradually without hesitation to help and sustain our Bitcoin investment , we don’t pray for bad things to happen but we can only hope to manage and solve this problems when it comes, that will help us to continue to accumulate and build our Bitcoin assets for such a long time.
Perhaps we don’t find ourselves in desperate situations that involves us loosing our Bitcoin with the help of emergency and reserved funds to solve this problem when it arises.