adroit: I have noticed the first mycelial threads within 3 days or so. Full colonisation takes approximately 1 fortnight. I am relatively inexperienced with this, but temperature seems the key: high 80's F for colonisation and high 70's for fruiting. For fruiting, humidity is important but varies between varieties. I only know the PF strain, which requires high 90's % humidity.
Also, the mycelium requires oxygen. I knock 5 holes in the lid of each jar for innoculation. Immediately after innoculation, I cover the holes with micropore surgical tape: this is breathable and seems to let enough O2 and CO2 to diffuse for rapid growth.
Another also, innoculation with live mycelium causes very rapid colonisation but seems to take longer before pinning occurs. I always wait for good pinning, then birth the medium and immerse in sterile water in a sealed container in the fridge for 24 hours before double ended casing in the fruiting chamber. This isn't large scale growing, just low maintenance hobby stuff. Cold water treatment and double ended casing increases the yield significantly. Double ended casing is placing the medium on an inverted lid filled with damp vermiculite and covering the top of the medium with 5mm or so of damp vermiculite.
More liquid medium growth results to come...
(What temperature units do you prefer? I use Celsius, but most people here are Yanks. Of course, to the purist, Kelvin is best. I can do Kelvin if you want. If we all used Kelvin and Pascals, I would be very happy indeed)