Growing herbs indoors can vary in duration depending on the type of herb, the growing conditions, and care provided. Generally, most herbs such as basil, mint, and parsley reach a harvestable size in about 6 to 8 weeks. Some herbs, like chives and cilantro, might be ready a bit sooner, often within 4 to 6 weeks. Factors that influence growth include light exposure, temperature, humidity, watering practices, and soil quality.