A lot of times stopwatch is not very convenient, because you have to remember to start it and then also decide what you will be working on. A similar feature, which in a sense works backward, is Tag last untagged time.

When you create a tag using Tag last untagged time, its start time will be:

• If this is the first tag of the day, start time = Day start time (first interaction with computer)
• If tags already exist for today, start time = last tag end time

End time will be current time.

You can access this feature by right clicking ManicTime icon and choose Tag last untagged time.

You can also add a global key shortcut and access it that way.