How Often?  When?  How Long?  
Sessions are usually weekly or every other week for 50 minutes in my Ft. Worth office.  In some cases I offer 90 minute sessions.  Appointments are scheduled on a regular basis so you can depend upon the consistency of therapy.  Fee payment is expected at the time of service.  You will be charged for missed appointments.  Statements will be available for you to submit to your insurance company.  I am not on network insurance panels, but some insurance companies will pay for out of network services provided that a mental health diagnosis is given to you. I see clients by appointment.  How long you will need to be in psychotherapy depends your readiness to make changes and upon the goals that your set in your work.