What is the longest time to hold your urine? Because of what?

The longest time I held my urine was in 2006, when I just went to college. I took my luggage to Guangzhou by long-distance bus, drank two bottles of water before getting on the bus, and then I was in a hurry to pee as soon as I arrived at Yangjiang Rest Station. From Yangjiang to Guangzhou, there is a traffic jam as soon as the car enters Guangzhou. As a result, I held it for about 4 hours. I didn't know there was a toilet on the bus, and I was too embarrassed to ask the driver. When I arrived at Guangzhou Tianhe Bus Terminal, I immediately found a toilet to pee. I remember.