I agree, I think it's because it is a first session, which ordinarily could be expected to go longer. She was just letting you know - she might have been looking at her appointment book or computer schedule at the same time, and just kind of blurted out that she had a two o'clock appointment following, so there was no option of going longer. Maybe at that point some people say, no I am definitely going to need longer. I am not that good on the phone for thinking fast so I wouldn't have, but maybe someone else could!