I have recently had to blast my horn for about 2 minutes while I was driving.
Got me wondering: Does using the horn for long periods of time damage it/wear it out?
2003 Opel Agila
No not at all, the horn is not gonna get damaged. My old Nissan Maxima once had a faulty hood lock switch and the alarm went off during night. The alarm was on for almost all the night and the horn was honking too, I knew it the next day when there was a notice hanging on my apartment door.