4.5 months

Illustration of adaptation:

This morning I was running late so I brought most of my oatmeal to school.

I ate it with chopsticks.

It should probably be noted that I tend to make my oatmeal kind of thick, and that when faced with the choice between the plastic spoon that had been used by uncountable people or the metal chopsticks that were in the sterilizer thingy, my decision was basically made for me, but still.