U.S. adults spend nearly two days per month using apps or web browsers on their phones, according to Nielsen research. Americans age 18 and up spent an average of 43 hours and 31 minutes per month using apps or web browsers on their phones during the second quarter of 2014, a sharp rise from the 33 hours and 48 minutes per month during the same period last year, according to Nielsen’s second-quarter 2014 Cross-Platform report. Yet for how much time Americans spend on their phones, they’re using a surprisingly low number of apps.