Approximately 20 minutes, unless you rust proof your car during the same visit, the two treatments will be done together, which will take between 35 and 45 minutes (one hour in winter).
When you are driving, over 90% of your decisions depend on what you see outside, in front of you. Sunlight, sand, abrasives, ice and salt can rapidly damage your headlight lenses. Headlights lose their lighting effectiveness sometimes up to 50 % after only a few years of use.
CAA-Quebec recommends dealing with a specialized company to have your headlights checked every three years and have them renewed or restored when needed for best visibility.
* Source : CAA-Quebec study: worn-out headlights threaten safety, October 2010.