My current T is usually good about giving us a 'warning' before time is up.

I've had T's that weren't so great. Kinda like, "Oh! Times up!" It's like... Well, crap. Guess I'll bandage myself up as I walk out the door!

Most of the time, I wind down with my clients, warning that we only have a couple minutes left. I have some clients, though, that tend to spew at the end of a session and it's hard to get a warning in.