It depends on what the product is and how long the company wants to promote it. This is usually as long as that product is seen as having a decent chance on the market, which may be any number of weeks, months or years.
Online advertising is communication used to encourage or persuade an audience to Look into what you are displaying threw the the Internet and World Wide Web. -E 11advertising.com is the website
Advertising per se may be a single effort of promoting products and services while advertising campaign is a series of advertising messages that build up an integrated marketing plan. Both may use...
Advertising - is a hole notion. Advertising campain - is concrete actions for advertising and promoting company, idea, product, people etc. For example you have all advertising for milk. And you have...
Almost as long ago as the internet's existence. As soon as large numbers of people had access to it, it became another valuable way to get the product across.