I prepared 10 small mother flasks last saturday and I am letting them sit in the shade and room temperature to wait if there is any contamination in the flasks.
So far I have not seen any changes in the color/consistency of the sowing medium but it may be too early to tell if I'm in the clear.

How long would it be before any contamination manifests itself? a few days? weeks?
What is the incubation period for the typical molds that would be encountered in such flasks prepared in the home/kitchen environment?