What are the conditions for bread to grow mold, and how long does it take?

Question

I know somebody doing an experiment on bread mold, but the bread has been sitting around in a sealed ziploc bag and hasn't grown mold yet. It has been around for more than 2 weeks. Why not?

Answer 1

depends on the bread and the preservatives added ,fresh home made bread  in humid tropics a couple of days ,factory bread with lots  of chemicals  a week or more under the same conditions

Answer 2

warm, humid, can grow in fridge after a while but the cold temperature retards the growth.