There is no fixed number of sessions for grief counselling. The duration depends on the nature of the loss, its impact on your life, the support available to you and what you hope to receive from counselling.
Some people find that a few sessions provide the support they need during a particularly difficult period, while others prefer longer-term counselling for more complex or longstanding grief. Your progress and needs will be reviewed together periodically with your therapist so that the focus, frequency and continuation of sessions can be adjusted over time.