Planned time (checkered in color) is the time you think you will use in order to complete a task for that day.
Logged time (solid color) is the actual amount of time you used on the particular task for that day.
You can use the planned time feature to plan out your day and anticipate how long it will take you to complete all of your tasks.
Events that have been auto-imported into a project from Google Calendar or Office 365 will already have planned time. The planned time will be a reflection of the planned duration of the event.
How do I add planned time to an entry?
Simple just add plan time to your entry in the "Planned time" box in the lower right hand corner of your entry.