You have an overview of your recent timers to start them again from the timer quickly.
Estimate your tasks before you start to track the time on your tasks. It's a good comparison point.
When you're done with a task then evaluate it. How long did it take compared to your estimation?
Estimate your main tasks as a comparison point to when you're done tracking them.
With the estimation of both subtasks and tasks, you will know how many tasks you can solve today.
Breaking your tasks into subtasks and tracking the time helps you be more productive.
Estimation is difficult in the beginning, but just get started and then you will improve over time.
You will see that your estimations will come closer to your time tracked over time.
This is why it's so important you estimate your tasks and track the time. It makes you better.