Forty minutes. A periodontal chart first — six measurements per tooth, recorded so we can compare it with last time rather than relying on an impression. Then ultrasonic scaling above and below the gum, airflow to lift staining from tea, coffee and tobacco, and a polish.
You will be shown what the chart found, on screen, including the two or three places you are consistently missing. Almost everybody has them and they are almost always the same spots year after year.
Where the chart shows pockets deeper than 4mm we will book longer appointments for root surface debridement rather than trying to do it inside a routine slot. That is a different treatment at a different price and we will say so before starting it.