To set your working time in Nutrium, you just need to click on the icon at the top of the calendar, in the section Agenda.
Then, you should establish your working days and choose the working hours for each one of them.
If you have several workplaces, you just need to associate each workplace to each time interval, a different color will be attributed to each of them.
If you want to set your lunchtime or add a new event, click on the "+" right in front of the hour and set a new time interval.
To learn more about this feature, click here.