How much time you wish to dedicate or commit to sales training will most likely depend on the type of product that you sell and the potential benefit that you will receive for completing the training. Commissioned sales people are more likely to attend trainings than salaried employees.
Learning to target a sales niche or area to market to is usually a key component of effective sales training. Determining if you want to sell for price, service, quality or a combination will dramatically impact on the type of sales trainings and techniques will be the most effective.