To add working hours you go to Tools > Intervals


To add a new intervall press the plus sign in the lower right corner 


Add a name and a description


To edit your new interval press the three dots on the right and then press "Edit Interval"


Then press "Intervals"


To add a new sub-interval press the plus sign


Add a name and then change the following:

Type = Custom

Time Range:

FROM = When the office should open (when you add a time here the TO field will appear)

TO = When the office should close

Weekdays:

FROM = The first working day in the week for your company.

TO = The last working day in the week for your company.

In the example below the working hours are 08:00-17:00 Monday - Friday.

It will be closed all day Saturday and Sunday

FOR A WORKING HOUR INTERVAL YOU SHOULD NOT ADD "MONTH DAYS" OR "MONTHS"

Press SAVE