This is hard question to answer accurately as every person and every condition is different, however as a general rule of thumb a condition or behaviour change may take 2 to 5 sessions.
If someone comes with a multitude of changes they wish to make, often this will take longer as you work on one issue at a time; sometimes it can be likened to peeling an onion until we get down to the underlining core issue whilst resolving each obstruction along the way.