You emergency funds should be of 3-6 months, and I believe that as you keep you bitcoin investment ongoing with your gradual DCA weekly accumulation, you investment will definitely be bigger than your emergency funds.
Having a strong backup fund is more important than being aggressive in investing
Both of them is important and it's only if you do it tge wrong way that it becomes a problem for you. If you have your back up funds in place which are your emergency funds, reserve funds and floats. You can invest aggressively to increase your bitcoin portfolio as long as you did not overdo it. However, the size of your bitcoin portfolio will determine the level of your aggressiveness.
question here is how long you can keep an emergency fund for Bitcoin holdings to be beneficial for protection.
Your emergency funds shouldn't be tampered as long as you are investing in bitcoin or hodling bitcoin. This is because if your emergency funds dries up, your bitcoin investment goes down and that's why you are to always refill your emergency funds when some part has been used to solve real emergency. There is no time duration to keep an emergency funds because it's a necessity.