Pilates routine

Her height and weight are pretty much irrelevant to the question.

Do you mean to imply that she is a faithful, by-the-book Pilates practitioner? If so,
30 to 45 minutes is the norm.

Do you mean to imply that she is obsessed with keeping slim and exercises more than most Pilates instructors and authorities would recommend? If so, an hour and a half a day would be considered pretty excessive by most folks in the Pilates community.