SEM (Search Engine Marketing) can take anywhere from a few hours to a few weeks to show results. You should expect to see initial traffic within hours of launching a campaign. However, it may take up to 2-3 weeks for your ads to fully optimize and reach their potential. The results depend on factors like your budget, keywords, and competition. You must continually monitor and adjust your campaigns for the best performance. Over time, SEM can drive consistent traffic and conversions as you refine your targeting. Patience and constant optimization are key to SEM success.