The length of time anyone comes to counselling is completely a matter of personal choice. There is no set amount of sessions you must or should attend.
For couples or individuals who have a specific, readily identifiable issue to resolve, this can often be achieved within 6 to 8 sessions or less. On the other hand if you are not exactly sure what the issue is, or if the work relates to more deeply rooted issues which may extend far back into your childhood, then you could well find that more time will be required.
Basically, how long you attend will be entirely down to you and what best suits your needs. This may covered by one or two sessions, but could also mean attending for several months, with the possibility of returning for counselling support over a period of years as the need arises.
I look forward to discussing with you in our first session what your particular goals are, and the approximate number of sessions you may need.