OK- Toss this in the cauldron.
Traditional Answers
According to various traditions, the outcome of a spell may take as little as a day or two or as long as several weeks. In many Pagan traditions, the general rule of thumb is that if you haven't seen something begin to manifest within four weeks (one lunar cycle), then you may need to revisit your working.
In other traditions, particularly in Hoodoo and rootwork, a spell is designed to be worked over a specific period (a seven-day candle spell, for instance). The results should appear within a designated amount of time after the working is complete.