## Set working time

Working time controls which days ION counts as working days when calculating lead times in plans. The value is a standard cron expression. ION reads the day-of-week field (the fifth field) to determine which days count as working days. For example, `* * * * 1-5` means Monday through Friday. For the full cron specification, see the [crontab manpage](https://man7.org/linux/man-pages/man5/crontab.5.html).

1. In ION, go to **Settings > Supply Chain > Plans**.
2. In the **Working time** field, enter a cron expression.