In SEO terms, a Listing is usually a website that allows you to submit a website URL as a way to generate backlinks. Places like Telephone book and Yelp are examples of very well-known directories you can find backlinks from. There's no definitive timeline for ranking higher on Google Maps. https://www.seobyaxy.com/blog/what-is-the-process-to-generate-more-traffic-on-web/