Your therapist should have your best interest at heart. He should care about you in all ways and that includes supporting you in your employment. If you have a job opportunity that would not be possible because of the therapy session, change the session time. you cant tell the employer you will work a different time - but you can tell the therapist you will come at a different time. Most therapists have evening and or weekend appointment to accomodate most of us that do have to work. You cant turn away a job offer for a 45 minute session.