39 is a lot

This morning I fed my son breakfast.  I asked him if he wanted some cereal.  He said yes, and I asked him how much he wanted to eat.  "39 pieces," he replied.  I laughed.  Not 38, not 40?  39 pieces?  "Yes," he replied.  This evening after we returned home, he said, "Dad, I want to play with you for 39 minutes."  39 minutes?  Not 38, not 40?  39 minutes?  "Yes," he replied.  39 is apparently a lot of something.  How he came up with 39, I’ll never know.  Kids say the darndest things!