YouTube videos appear to have long shelf lives, while the opposite is true for Facebook posts. As for emails? Recent data from MailerMailer suggests that opens peak at one hour post-delivery (11.1% of an email’s total opens), falling off quickly during each following hour. At the 6-hour post-delivery mark, the average email is getting 4.5% of its total opens. On a cumulative basis, 51.8% of an email’s opens have occurred by that time.
The data is based on a study of 1.4 billion opt-in messages sent globally during 2012.
Further results indicate that roughly three-quarters of all opens have occurred by the 18-hour post-delivery mark, with the half-life of an email generally being around 2 weeks in total. Read the rest at MarketingCharts.