Saturday, I changed out my back tire in fifteen minutes. In preparation for training, Monday evening I changed the back tire back to the training tire from the road slicks. It took about ten minutes. This morning, the tube popped. The tube was pinched in the tire.
I changed the tube out, basically changed a flat and began riding again in seven minutes. It is important to say that this is the back tire because gears are involved. Not the two minutes that is desired for, but not bad for a girl.