Short term investment is just like trading and that does not require much of emergency funds because if you understand what emergency fund is, you will know it is best suitable for long term investment because it serve as a protection of the investment itself because that is what the investor resort to when there is issues that need urgent attention which was not accounted for or expected to happen. If someone buy bitcoin and hoping to sell when price rises a little and he see reasonable profits, I do not see the need to keep emergency funds. Therefore, emergency fund is indeed crusial to sustain the investment but it is mainly for long term investment.
Emergency Fund Requirement is a very important chapter for every investor as it is your responsibility to maintain your investment while it is running. Short term trading is a form of gambling. Long-term Bitcoin investing recommends you keep a large emergency fund to cover your household's daily expenses for at least 6 months or more. Growing your emergency fund depends on how long your investments last.
Emergency fund is not only necessary for long term investment but also for every investment. This is because if you invest in Bitcoin and its value goes into a further down trend right away, you may face more losses. If you have an extra emergency fund, you can reduce the UP by creating opportunities to buy more bitcoins in a down trend which can increase bitcoin holdings in the future.
You should not dive on something risky if you don't have some safety net(Emergency Funds) that can save your ass in crucial times. That's why aside for paying attention for building up your portfolio we also need to separate some amount intended for this funding's. We don't need to put one time big amount for this if they are worried that they might lack of funds to use for their investment. Since they can put some extra amount which they think enough to add up some money intended for this used.
Also don't used your emergency fund to buy anything you want even bitcoin, Just let it sit there if you think you have extra just gather other extra funds since once you touch that money then you might think about its fine to use it and you will just pay it when you earn which is totally wrong mindset or action to do. Just separate funds intended to last for 3 to 6 months and I think you will be fine with that.