(I've) got to get moving
I need to leave. Well, I've got to get going. It was lovely to see you, as always. Got to get moving before I miss my train!
(I've) got to get moving.
I have to leave right now. (See also (I) have to shove off for other possible variations.) Tom: Time to go. Got to get moving. Sally: Bye, Tom. Mary: It's late and I've got to get moving. Sue: Well, if you must, okay. Come again sometime. Mary: Bye.