The Scrape Page Limit is the number of web pages the Web Scraper can scrape before your page limit is renewed on the renewal date. Every time the Web Scraper traverses a web page during your scrape one page in the Scraper Page Limit is used. The Scrape Page Limit is not affected by taking captures. You can find your current Scrape Page Limit on your account page.
If you go over your limit you cannot do anymore scrapes until your package renews, or you buy the same or another package.
It's a good idea when creating your scrape to use the Scrape Limit option on the Scrape Options tab. This will limit your scrape to set number of pages, allowing you to see if it works before doing a full scrape.