20 minutes for me. I carry spare tubes and repair at home unless I have more than 2 flats on a ride. The very stiff thick tires made to withstand punctures can be extremely difficult to remove (I've broken levers); the softest I can mount with bare fingers. I saw a page of pictures in Bicycling mag years ago of a pro rider repairing his tube in 22 seconds. He somehow knew how to find the hole without unmounting the tire, inflated it with his breath, used a glueless patch (which have never worked for me.) No tools.