Unless you are not addressing anything and just babbling on, I don't see how ending session early would help, though I have had sessions end early because I covered everything I was comfortable addressing (it was also trauma stuff, and I was anxiously giddy and pressured, so I got through everything very quickly). I never found those abrupt ends to session useful, and always felt like more should have been covered, but my defenses were up at the time, and I think t felt like she was not able to get anywhere.