9 minutes 30 seconds

Go out into the garage, disconnect bike from Chariot.
Ride 1 km from our house, up the hill to the corner of Laurelwood and Erbsville (3 minutes, 37 seconds)
Buy two slices of pizza.
Ride 1 km back home (1 minute, 55 seconds)
Put bike back in garage.

9 minutes 30 seconds