Maryam Kamvar and Shumeet Baluja from Google published a paper on trends in mobile search. These are the key findings:
The average mobile query was 2.56 words and 16.8 characters.
The average length of spoken queries to Google was 2.1 terms.
It takes users a significant amount of time—an estimated 39.8 seconds—to enter these queries.
The time to query [...]