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your gunna die in the end
anyways so what dus it really matter?

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I took some shrooms,
they were good to me
but then my weed
fell into the sea

but for your case right now, i'd say your best bet is if you've already birthed the cakes to get what you can (even if just pins) before you have to go and start over upon returning. that way at least you should have maybe enough for a small trip. If you haven't birthed you could either just wait until you get back to birth them (this would give the mycelium a chance to colonize the substrate, however i guess they'd probably dry out and die in that length of time. Or you could birth and try to set up some kind of casing that would be big enough so the mycelium would spend the time colonizing the casing and then pinning, but that is touch and go because if it gets contaminated you are screwed, and if it colonizes too quickly and there is no one to play with environmental controls.... just doesn't sound like it would work.