The following are Current Best Practice deadlines for each scheduling category:

• Daily schedule: 20 h before start of job
• Weekly schedule: 72 h before start of week.
• Shutdown: 1 weeks before start of shutdown if the shutdown is shorter than 16 hours.
• 4 weeks before start of shutdown if the shutdown is longer than 16 hours.

Some plants divide the scheduled time into categories, such as down due to no orders, down due to maintenance, etc. See cut-off time for further information.