Well, Andy Reid joined the Chiefs in 2013 and reached the Super Bowl in his 7th season (2019). So Zimmer could match that by winning the SB this season. I'm not holding my breath..
I think the similarities between Reid and Zimmer end with his years of service. First, Reid had 14 years as an NFL HC before joining the Chiefs. A lot of coaches (Pete Carrol, Bill Belichick to name a couple) were far better in their second term as a coach - I've often thought Zimmer could be a better coach if we fired him and he took that experience elsewhere.
More importantly, look at the Chiefs' record during Reid's tenure: 11-5, 9-7, 11-5, 12-4, 10-6, 12-4, 12-4. The team stayed strong, generally improving. But Zimmer's is 7-9, 11-5, 8-8, 13-3, 8-7-1, 10-6. He's up and down every other season, and that follows his strength of schedule. His better years happen when he gets to play a 3rd-place schedule.
I'm in agreement, just had to cite the Reid comparison.