I don’t have time to check flight logs but I personally landed at LGA coming from MDW on Sunday. And I also know people who got diverted within the hour coming back to LGA that night. 30-40 minutes doesn’t seem accurate. That aside, if you’ve ever done operational staffing, you’d know that you should probably have at least one redundancy. When there is any chance of emergency or two events happening simultaneously, you should have more than one person.

One last meta point. We live in the wealthiest country in the history of the world, and the highest air travel prices (some part is a function of longer distances I know). We should expect that we have ample coverage, if not over-coverage, at all times for one of our major metropolitan airports. Pay them.