I would think that 3 months of an emergency fund would be about the bare minimum to have if you are going to start to act boldly.. and even with ONLY 3 months of an emergency fund, you gotta be careful about ever dipping into such emergency fund except for strict emergencies.
If you have 6 months of an emergency fund and you know that you are never going to let your emergency fund dip below 3 months unless you are int he midst of a true emergency, then you can be a lot more bold because you might even float one of the months so that you are mostly between 4-6 months in your emergency fund.
I guess my point, is to be careful if you are starting to get a lot of BTC investment and if you are starting to use more adventurous times of investing, including getting a 30% advance of your pay for 3 months or any of those kinds of things, even though it might work out, you seem to be playing with fire if you only have 3 months emergency and you also get a 3 month advance for 30% of your income... it may well end up working out, but it does not seem like a good balance especially if you might be in a position that you don't want to end up getting forced into selling any of your BTC at some inconvenient time, for example when it might be dipping extensively.
I think the 3-month emergency fund is enough as long as we can maintain our cash flow so that your expenses and other sudden needs can be covered from the main cash flow, but when things are out of control in a tight sense then use the emergency fund as long as it can save you.
If the emergency fund is sufficient for 6 months then it is enough for them to be free in targeting aggressive investment levels and even if the emergency fund drops but it is still at the minimum limit, when the cash flow has stabilized, it may be possible to refill it again slowly so that the emergency fund returns all to hold for 6 months.
With those who use challenging investments, I think it needs to be felt because it will adjust in the future how the balance is more sensible including 30% of their total salary, I can only do it when the emergency fund is safe, say 6 months in the bag, then the level of aggression towards BTC must be done if it is not appropriate, the percentage will be lowered, if I am still able to continue because this depends on managing expenses and the percentage determined, the cash flow will be easy to manage.
For that we need to be careful and if we think about using our emergency funds just to buy bitcoin we should assure for ourselves that we are ready for the consequences of the action we made and we have huge understanding about the market also how bitcoin move. Since if we risk all of that and think about its fine since we expect bitcoin will go up then we possible be fucked up with that and might everything we have might blow up.
That's why aside for long preparation and having a emergency fund set much really better if we are also aggressive learning a lot of information needed before investing on bitcoin so that we can save up ourselves to any negative possibilities and we would not easily get affected if there's fud scattering then here we are having a lot of bitcoin holdings since we provably lose with that if caught up by fuds spreaded by some people who want to destroy the patience of people trying to hold their coins for long time.
With those challenges its better if we could balance all important things needed to do so that we would not came to the point touching our emergency fund just to have money to invest on bitcoin again. We also know how to manage on our finances so our bitcoin investment will be smooth.