We do a Courtesy Inspection on every vehicle. I became affiliated with ATI a few years ago and they demonstrated to me and the techs that a thorough inspection can be done in an average of 15 minutes. On the older or more used up vehicle it may take longer, but as someone posted above that usually means that there is more opportunity for additional work and an increase in ARO. Then we moved to tablet inspections, we like Autovitals, and found that an inspection that is emailed to a customer with photos of the item in question was a very strong selling point. Autovitals customers that track things closely, (I'm not so good at that), can document that more photos turn into more sales. The customer can see the split CV boot, or the oil leak, or the scored brake rotor and have a much better understanding of what is being recommended. I'm sold on tablet inspections. Most systems allow complete customization of your inspections and also you can have several inspection sheets set up so that choice can be made if there is need to deviate from your standard inspection.