Where is Edit Work Hours in Dynamics Online?

I am about to implement Service scheduling in my CRM Online instance and am reading lots of helpful information on the internet, but it's all for CRM 2013 which indicates you "Set Work Hours" by going to 

Settings > Administration > Users > and then selecting  user.  Then there should be a "Set Work Hours" on the Ribbon.

None of this is the case in 2015.  Can someone direct me to where users would do this in CRM Online and what privileges are required in their security role?  I see something under Settings > Security > Users, but it doesn't have anything for "Set Work Hours."

Thanks!