Digital marketing includes both organic and paid marketing strategies. Organic marketing, such as SEO is a long-term investment that requires patience before you see your better rank on search engines and more visitors to your website. On the other hand, paid marketing, such as Google ads or social media advertising may give you results in less time as they target the specific customers using insights and targeted keywords.
Depending on the strategies, your goals, marketing channels, industry competition and business goals, you can achieve results in days, weeks or months.