Shiitake is induced, not simply waited for. DMR's method is a cold water shock at 4 to 6 C for 10 to 20 minutes. Primordia begin 5 to 8 days later, and fruit bodies are ready 5 to 7 days after that.
Harvest by taking the stalk and breaking it away from the wood. DMR is explicit: do not tear mushrooms off the surface, and harvest early rather than late.

