That's how long it takes for the beeping horn car alarm to completely discharge the batteries on my neighbor's brand new Prius. Just in case you needed to know.
After about an hour and half, the beeps become weak and almost plaintive.
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One of our neighbors had his car alarm blaring in the middle of the night. It went on for nearly an hour as the alarm reset itself, then triggered again. I finally called the local cops. An officer responded in a few minutes. As he pulled up in front of the house, the porch lights suddenly came on and the owner came out to tell the officer that he'd turned it off. Before the cop got back to his patrol car, the alarm triggered again! This time he made the owner disconnect the battery cable before he left.
The owner - an unlikeable dick to my way of thinking - didn't actually fix the alarm. He merely disconnected it from the horn. For a week afterward, his car sat in the driveway flashing it's lights over and over until the battery finally gave out.
I was brokenhearted, and for some strange reason, I was unable to locate my battery charger when he asked to borrow it.