A PTC "aka paid to click", is a site where advertisers pay the website owner to distribute their ads to its users. The users view these advertisements and in return, receive money. There are many different kind of PTC sites and you can expect to earn anywhere from 0.001 to $0.02 per each advertisement viewed "sites that offer a higher rate, ranging from $0.01 - $0.02 are known as ( Bux ) sites". There are many scamming sites out there on the web and only a few "legit" ones are actually paying and not planning to steal your money in the short future. All PTC sites have a timer for each ad before you are credited, most sites have a timer ranging from 15-30 seconds for each ad. Once the timer has completed, you will receive credit instantly to your account.