I'm 8-5 technically with my availability hours but I almost never wait until 5 to leave
By 4pm if it ain't shyt going on I'm out

If they call me bout something after 4 chances are it's already 5pm or close to it so I just say I'll look into in the morning and I'm already at the house
One of the reasons I rather work in the office is that I don't have to actually be in the office for 8hrs and I just gotta look busy. Plus time I spend traveling to sites is a part of my work hours. Some days I'm driving for 4-5 hrs and only working 2 or 3 hrs