This varies depending on the case. If you suffer from a psychological disorder, weekly appointments are recommended, possibly every 2 weeks. Regularity is important to ensure progress monitoring and therapy success. I therefore advise against stopping therapy without having found another treatment alternative.
However, if we start with a counselling process (i.e. without a psychological disorder), I would normally suggest starting with weekly sessions to achieve our goals. However, depending on your specific situation, more sessions per week or one session every fortnight may be more appropriate. For some specific cases, single counselling sessions or monthly sessions may be helpful, but it depends on the situation. A change in the frequency of counselling is of course possible at any time during the course, if desired or necessary.