> ## Documentation Index
> Fetch the complete documentation index at: https://docs.firstresonance.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Set working time

> Define which days of the week count as working days for lead time calculations in ION.

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).

## Set working time

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

## Related

* [Configure demand settings](/administration/supply-chain-settings/configure-demand-settings)