Obviously, in this case, it was UA's fault.

I'm curious how long the brakes take to cool down after a normal landing. Obviously there's time built into the schedule for the turnaround. If Southwest does 30-minute turnarounds, plus maybe 10-20 minutes of taxiing at each end that implies at most about 60 minutes but possibly much less. Just curious how much harder the brakes work in an emergency situation compared to business-as-usual.