The Internet Archive discovers and captures web pages through many different web crawls.
At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
Web wide crawl with initial seedlist and crawler configuration from October 2010
TIMESTAMPS
The Wayback Machine - https://web.archive.org/web/20110106212016/http://www.searchengineoptimising.com/glossary/glossary-of-computer-and-internet-terms/impression
An Impression is counted each time a visitor looks at a Web page. One user can create many impressions on one web site as they could view a page many times over. A unique impression however is only created the first time they look at the page.