I am another that expects my horses to stand tied as long as I need them to. That can range anywhere from 10 minutes to 10 hours. What I like to do with young horses is give them a good ride, put their halter back on, and depending on how the session went and whether I decide they need another one later, I will either untack, wash them off, and tie them up or leave them tacked up and tie them up while I work with others. I consider it an action worthy of pride when I can jump off a horse in the middle of working cattle, loop a bridle rein over the fence, and come back 3 hours later to him still standing there even when he could have easily just walked away from the fence. I like a horse that sees the tie or feels the tie, and the first thing they do is cock a hind leg and go to sleep.
Just a few months ago, my brother was riding with me when he came off a bronc and broke 3 ribs. Didn't have time to untack and put up the horses so his horse stayed in the roundpen and the filly that I was riding got a halter put on and was tied up to the trailer. Come back home from the ER like 5 hours later and guess where the filly was. Still tied to the trailer with the saddle on and her eyes closed.
Maybe it's the way I grew up or something, I don't know, but I just cannot fathom why a person would be completely accepting of a horse that will break loose when tied