I use an app called Time Recording: https://play.google.com/store/apps/details?id=com.dynamicg.timerecording https://play.google.com/store/apps/details?id=com.d

I use an app called Time Recording: https://play.google.com/store/apps/details?id=com.dynamicg.timerecording https://play.google.com/store/apps/details?id=com.dynamicg.t... I track time spent on work broken down into dozens of subtasks, which is really helpful for analysing later and estimating future work. It's easy and quick to switch tasks or retroactively adjust or track time. There are various reports you can view or export as CSV.