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# How do I set different transit times?

The most common way to use transit rules is to set different delivery estimates based on the customer's location. You can easily group countries together or set specific rules for individual regions.

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## Why we separate processing and transit times

It can be confusing at first to see two different rules for time. We separate these to ensure a better **separation of concerns** in your logistics chain:

* **Processing time (Product-based):** This is for your internal operations. You usually use this with product-based conditions (e.g., "Custom tags" or "Specific collections") to define how long it takes *you* to get an order ready.
* **Transit time (Location-based):** This is for the carrier's journey. You usually use this with country-based conditions to define how long it takes the *truck or plane* to reach the customer.

By keeping them separate, you can update your warehouse processing speed without accidentally changing your international shipping estimates.

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## Setting transit times by country

To create a transit rule for a specific destination:

1. Go to the **Transit** section in the app and select **Transit time**.
2. Click **New exception** and enter your desired transit duration (e.g., 3–5 days).
3. Add a **Condition** and select **Shipping country**.
4. Choose the countries or regions that should receive this specific transit time.
5. Click **Save**.

![Transit Time](https://storage.crisp.chat/users/helpdesk/website/-/a/4/8/8/a488abe1860c5800/transit-time_th5zx7.png)

### Selecting the shipping address source

By default, Delm uses the customer's **IP address** to detect their country. However, if your store has a country selector, you might want Delm to match the country the customer has manually selected.

To change this:

1. Go to your **Shopify Admin > Online Store > Themes > Customize**.
2. Open **App embeds** on the left sidebar.
3. Find **Delm Core** and locate the **Shipping address source** setting.
4. Change it to **Current store country**.

![Shipping Address Source](https://storage.crisp.chat/users/helpdesk/website/-/a/4/8/8/a488abe1860c5800/shipping-address-source_vxs1t2.png)

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## Best practices for transit rules

To ensure your delivery dates are always accurate, we recommend the following setup:

### Group similar countries

You don't need a separate rule for every single country. To keep your list organized, group countries that share the same transit duration into one rule (e.g., one rule for "Germany, Austria, Switzerland" with 2–3 days).