Question on JT's 85X3 recipe
Can someone help me with this formula http://www.farine-mc.com/2010/04/jts-85x3.html 
When it calls for the biga, poolish and a levain, does it mean that these were mixed the day before? I am a bit confused because step 1 also includes a 10 hour fermenting period when all 3 are combined. Thanks in advance.