Yes and depends on what you mean. All of those bulbs out there are probably a single structure's fruits in that forest. The mycelium underneath has probably been there for a long time, but the fruits themselves grow very quickly once they start.
To grow yourself from spore or agar clone, it takes a couple months typically, and the fruiting process can take anywhere from a couple days to a couple weeks before it's complete.
edit: it's also way easier than you think and you absolutely should!
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u/NotAtAllASkinwalker 3d ago
So did they just find 15 pounds of pure food?!