Quick answer
Standard CBT courses run 8–20 weekly sessions of about 50 minutes — panic and phobias at the short end (sometimes fewer), OCD, health anxiety, and complex patterns longer. Early change often shows by session 4–6; skills keep compounding after therapy ends. Homework pace is the biggest variable you control.
Typical courses by pattern
Specific phobias: the sprint — exposure-based protocols run 1–5 sessions, including validated single-session treatments. Panic disorder: commonly 8–14 sessions. Social anxiety and GAD: 12–16 typical. Health anxiety: 12–16 with a specialized protocol. OCD: 14–20 sessions of ERP, sometimes more, with intensive formats (daily sessions over 2–3 weeks) as a validated accelerant for severe cases. Add sessions for: co-occurring depression, trauma history, long entrenchment, or multiple patterns braided together. Subtract for: recent onset, single focused problem, strong homework engagement. Sessions usually run weekly through the active phase, then taper — biweekly, monthly — into planned ending with boosters.
Where the time actually goes
The arc explains the count: sessions 1–3 build assessment, formulation (your loop mapped), and education; sessions 4–10ish carry the retraining freight — restructuring drills, experiments, exposure ladder climbed rung by rung (each rung needs repetitions, and repetitions need weeks); final sessions consolidate and relapse-proof. The hidden multiplier is between-session volume: a client doing four exposures weekly covers the same ladder in half the sessions as one doing one — homework doesn't just support the timeline, it largely is the timeline. This is also why 'how long' is partly your call: the office hour sets up the week; the week does the treating.
Reading your own timeline
Fair expectations: some felt shift — understanding, first wins, symptoms budging — by sessions 4–6; clear functional movement by 8–12; if genuinely dosed weeks are flat at that point, adjust plan rather than extend identically (protocol, medication addition, therapist match). Don't judge by comfort mid-course: the exposure phase can feel harder than baseline while working perfectly. Endings should be planned, tapered, and slightly anticlimactic — you leave before feeling 'finished' because the design assumes continued self-run practice, and follow-ups confirm gains typically grow post-therapy. And keep the frame: 8–20 hours of structured work against years of symptoms is, hour for hour, the best trade in mental health.
A note on getting help
You can learn a lot of CBT on your own, but a trained CBT therapist personalizes the work: they spot the patterns you can't see from inside them. If your anxiety significantly limits your life, consider working with a professional rather than going it alone.
This article is for general information only and is not medical advice, diagnosis, or treatment. Always consult a qualified health professional about your situation. If you are in crisis, contact your local emergency number or a crisis line immediately.