In April '09, the average online American had 61 internet sessions, visited 108 domains, surfed 2,443 web pages and stayed on each page approximately 57 seconds, according to (pdf) monthly internet usage data from Nielsen Online.

These April numbers reflect one fewer monthly internet session than March data, as well as visits to three fewer domains and 111 fewer pages vs. March, in part because April is a shorter month.

Average time per page is up from 56 seconds per page in March, and 55 in January.

Online Video Usage

Nielsen Online provided overall online video usage data for April 2009, which shows that approximately 119 billion unique viewers watched seven trillion total streams during the month. The numbers reveal that year-over-year, total streams are up 24%, streams per viewer are up 27% and time per viewer is up 58% percent.

Top 10 Parent Companies/Divisions

2009 data for the top parent companies/divisions reveals Google remains the top parent company, with a unique audience of more than 138 million home and work internet users, and an average time per person of one hour and 58 minutes on its sites. Other sites in the top 10 had smaller unique audiences, but higher average times spent on their properties.

Nielsen defines the parent level as a consolidation of multiple domains and URLs owned by a single company or division, MarketingCharts writes.

Top 10 Web Brands

Google also remains the top web brand for April 2009, with a unique audience of more than 131 million. Yahoo, MSN, Microsoft and YouTube round out the top five.

Brand level is defined as a consolidation of multiple domains and URLs that has a consistent collection of branded content.