For most companies, this is set under

Manage My Business » Business Settings » Manage My Departments

Select a department to edit and at the bottom, you will see the grace periods and length of meal/break.

screenshot-at-nov-14-10-54-27

Other companies that use shift rules will see it when they edit a shift under

Manage My Business » Store Rules » Manage Shifts

 

screenshot-at-nov-14-10-58-05

 

Grace periods can also be adjusted per employee as needed by going to Grace periods defined in employees’ profiles overrides his/her department rules.

screenshot-at-nov-14-10-55-08

screenshot-at-nov-11-08-49-13