It will start growing right away, but the growth will not be visible on an agar plate immediately.  Here are some resources that can help you learn more about the fungus:

http://www.aspergillus.org.uk/content/growing-fungi-dna-extraction-fgsc

http://onlinelibrary.wiley.com/doi/10.1111/j.1364-3703.2007.00436.x/abstract

I agree with Dr.Anam, the conidia are growing quickly, but not visible

Hi Darcy

Do time course experiment in liquid medium, collect sample (1 mL) every 1 or 2 hour, measure the OD and make a slide of each time course to check the formation of conidia (under microscope), this will gives you more data.

hope this helps