On Ferrari, I started watching in the 90s when they were mince. They won a constructors championship in 1983, and not again until 1999. 16 years. And that was a huge deal at the time.
We are approaching that milestone again, they last won in 2008.15 years ago.
The difference is that in the run up to 1999, they were improving and challenging for the titles. They aren't anywhere near the front today. The flaws run right through the team, from leadership and strategy to hiring Carlos Sainz, always one to bin the car into a wall.
Still, that record is favourable compared to the other "vintage" teams, McLaren and Williams.