It takes 1 hour for refrigerated dough to come to room temperature.  It takes 15 minutes to shape the dough and 2 hours to proof.  The bread takes 30 minutes to bake and 15 minutes to cool.  If the bakery opens at 6:00 am, what is the latest time the head baker can make it to the store to start working?
It takes 1 hour to bring the dough to room temp and 2 hours to proof the dough so that's 1+2 = <<1+2=3>>3 hours
It takes 15 minutes to shape the dough, 30 minutes to bake and another 15 minutes to cool for a total of 15+30+15 = <<15+30+15=60>>60 minutes
There are 60 minutes in 1 hour so that takes him 60/60 = <<60/60=1>>1 hour
In total it takes 3+1 = <<3+1=4>>4 hours from start to finish to make the bread
If the bakery opens at 6:00 am and it takes 4 hours to prep then the latest the head baker can show up is 6-4 = <<6-4=2>>2:00 am
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