Application or timetracking Is there any android app to monitor the time you have worked with another app in the android device?
I want to see how many hours I use an app in a day.
You can simply dial *#*#4636#*#* in your native dialer.

You will receive a list of options :

Phone information

Battery information

Usage statistics

Wi-Fi information

Third option is what you might want to choose.
Sort the results by Launch count, and you will receive the list of apps in descending order of usage time.