Including pumping it back up with the worlds slowest compressor, about 15 minutes. The plugging bit takes a minute or so. Pull the screw, ream the hole, insert the plug guide, screw on the device that compresses the plug down and forces it through into the hole, remove, pull the plug with pliers to seat it inside the tyre, and you’re done. The bit sticking out is trimmed flush with the tread with a sharp knife.
it’s the internal foam that is the main reason to get it done properly, I pulled a chunk of it out with the reamer and it’s pretty insubstantial stuff, a lot softer than the plug, which needs to screw-jacked through a steel nozzle inserted into the tyre (otherwise the size difference would be akin to getting a champagne cork back in the bottle), but better safe than sorry. A proper repair will be done this week, but at the moment it’s holding air a hell of a lot more effectively than a screw!