Your team's default hours and work days are set in Team Settings, but what about when you need to schedule part-time employees or contractors?
You can set custom hours per day and the number of days per week for individual team members by clicking the Part-time box from within the person's profile on the People page.
If you ever need to adjust a person's capacity in the future, simply increase/decrease the hours on a specific day, and a new "Apply To" field will appear. There are two options for setting new hours:
All past and future dates: This option impacts a person's past/future capacity. For example, reducing Thursday from 8 hours to 6 hours will add 2 hours of overttime to every previous Thursday where the person had 8 hours of tasks scheduled.
A specific date onward: This option allows you to choose a date in the past or future to apply the changes. The date must be at the start of the week (Sun or Mon based on your settings). Using the example above, reducing a person's capacity on Thursday from 8 hours to 6 hours starting this week, will not impact any of their previously scheduled tasks.
Specific date changes can be applied to full work days as well. If a person doesn't work on Fridays during the summer, you can remove Friday as a work day for them when summer starts.
And then re-add it as a work day once autumn rolls around.
Check out this article for more on adjusting the work days and work hours for your full team.