Go to "Menu" and select "Staff and business settings" then "Service prices & timings"

Click on "Edit" beside the Category you want to edit e.g. Colouring

Click on the Service you want to edit e.g Balayage

Click on the Application Time or Processing/Development Time you want to edit

Choose your new Application Time or Processing/Development Time from the drop down.
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Note: Application & Development Time can be set in 15 minute increments.

Once you have made the amends for all roles, scroll down and hit 'Save Changes'