According to a recent Nielsen report, the average smartphone user in the U.S. has around 42 apps on his or her device, of which he opens less than 10 on a daily basis.
So when are consumers most likely to use apps?
According to Nielsen's research, apps are mostly used when the user is alone, waiting for something or just trying to kill time. This indicates that consumers see apps as a welcome distraction when nothing else is going on, but tend to put the smartphone aside when they are engaged in other activities such as working or exercising.
This chart shows in which situations American smartphone users typically download apps.
You will find more statistics at Statista