As the search engines become more targeted at capturing traffic on mobile devices, they now look much more favourably towards businesses with fully mobile optimized sites. It is not uncommon for a company to move up the rankings as a result. Most projects take a very short time of 1 to 2 weeks and depending on how much work the client needs to be done will determine the cost. Highly advised service as mobile search and purchases are only going to increase. If you don't think AMP (Accelerated Mobile Pages) is important with Google moving to a mobile index in 2017, then revisit your thoughts. https://searchenginewatch.com/2016/10/18/google-index-set-to-go-mobile-first-within-months/ Still, don’t think you should invest in mobile optimization? Next time you’re in line at the bank or the grocery store, take a look around and see if you notice anybody using a smartphone.