Apprentices are notified each month on the 1st to submit their OJT. They're reminded on the 5th of the month and receive notice of being overdue on the 15th.
Supervisors are notified whenever an apprentice submits. They're reminded of time cards needing approval on the 9th and notified of any overdue time cards by the 13th. They're also notified monthly regarding updated reports if they have assigned apprentices.
Admins are notified when there are overdue apprentices on the 15th and when reports are updated each month on the 1st.
Everyone has this core schedule in their right sidebar in Time Cards: