SimpleRelevance-Email-Click-Frequency-by-Gender-Aug2013Consumers open emails throughout the day, but only click through those emails at specific preferred times, and those windows are often short, per results [download page] from a SimpleRelevance study. The study suggests that while email opens occur during as many as 23 hours of the day, 62% of consumers have only a single hour per day in which they prefer to click through an email message, a fairly surprising result.

via Many Email Recipients Said to Have a Short Window for Clicking.