> ## Documentation Index
> Fetch the complete documentation index at: https://docs.upflow.io/llms.txt
> Use this file to discover all available pages before exploring further.
# My customers' portal links validity
> Control how long Upflow customer portal and invoice links stay valid, from 1 to 1000 days, and understand the default 25-day expiration on shared tokens.
When sending email reminders to your customers, you have the possibility to include their Upflow portal link for a quick access and payment (read more about [Collection Tags](/en-us/collection-and-collaboration/workflows-customize-your-collection/collection-tag-inserter)).
## Portal link's duration
When the portal link is generated—sent via an email reminder or copied from the app—its unique token has a default 25 days validity.
If your customer tries to access their link more than 25 days after receiving it, they will see an error message indicating their portal link has expired.
## Manage the link duration
#### Manually
From your Upflow Settings, in the [Customer portal section](https://app.upflow.io/organization/-/settings/customer-portal), you can update the link validity:
* Minimum: 1 day
* Maximum: 1000 days
* Default is 25 days
Don't forget to click **Save** at the bottom of the page!
⚠️ The new link duration will be applied to links generated after the update is saved. Any links sent before this update will remain on a 25-day validity.
#### API
You can also manage the links duration using our API. Here's more details on this configuration: [How to Generate a Customer Portal URL via API](/en-us/customer-portal/branded-portal/generate-portal-url-via-api).
### Invoices links
When using the "Carrying invoice link" collection tag in your email reminders...
...the invoice link's duration is the same as the portals'. Beyond this delay, the invoice link won't be accessible anymore and a "404 error - File not found" message will be displayed instead.
Any questions? Click the **Submit a request** button at the top.