I was going through MD 11 training with the last of the DC 10 pilots, some had been sitting for 2 years. Those skool haus instructors earned every penny they were paid! My FO also a 10 holdout was really sharp and he knew most of the captains from the 10. Some had been plumbing since age 60 and were now coming back to the age of glass, it was dark times for many!