You should try to make it regular, generally no less than monthly and often weekly or biweekly. Although needs are varied, normally a well prepared session of spiritual direction need not last for more than half an hour. It is good to jot down concrete resolutions drawn from the normally few words of advice given. These resolutions should be brought to prayer and action and then spoken about if possible in the next meeting. Try never to leave your meeting without setting up the next appointment. Certainly the quality and quantity of your prayer and spiritual reading and sacramental life should always be touched on. Your struggle to live as a Christian in marriage and family, work, friendship, and social life should normally be addressed -- specifically. There should be an effort to address a very particular area of life which needs improvement, that defect or fault that keeps you from making more rapid progress towards holiness. With time your efforts to share your faith in a natural way with those around can also be a topic of discussion. These efforts may well result in God's grace in reconciliations, conversions, and vocations. And, oh yes, from time to time you may simply need to unburden yourself of unexpected joys and sorrows that come on your pilgrimage to the house of God, the Father. If you are seeing a priest for direction, you may also want to avail yourself of the Sacrament of Penance, adding the sacramental grace to the actual graces received from being open and docile in the conversation with your spiritual director.
[I forgot where I copied this from]