The plastic bag is filled with willow woodchips mixed with pleurotus ostreatus spawn. It took 4 weeks for the mycellium to overgrow the woodchips. The 5th week, the mushrooms started to come out the fissures in the plastic bag.
During 5 days and 5 nights I took a picture of the growing mushrooms, every 30 minutes. Unfortunately, the flashes didn’t went off several times, which gives some jumps in the steady growth pace.
But the whole is a nice example of a natural time bending process, 5 days and nights compressed in 30 seconds.

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