Considering bitcoin investment as emergency money doesn't seem a bright idea because this will mean that once you need the money you should sell it a market value and sometimes it could be below your entry point.
The exit strategy is a long time movement because you must wait for the right price to convert your money into fiat so you won't be able to have access to your funds right away.
Emergency money should be in fiat.
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Really true emergency means in an instant you  have money in no longer time,as we know here in bitchoin it takes many months to receive your reward,so never use this bitcoin as emegency possible.