Warm up time required for a "Hot" bake
For the last 5-10 bakes I've done, I've been doing a modified version of the "turn off your oven" method of baking. In that method, you preheat your oven to a high temperature (Sune @ Food Geek went to 500 deg F) and then turn off the oven for the entire 20 minutes you're cooking with steam. You then turn the oven back on after you vent the steam. Recently, Tom @ The Sourdough
Source: thefreshloaf.com