---
schema_version: "1"
id: b9f989f1f4a2a3319205fd07df374d7297a3e5453586cf43351b0ec2cad8152d
title: Refresh a Send Time Preview
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/mktg/264-0-0/mc_anb_einstein_sto_refresh_preview.md
canonical_url: https://help.salesforce.com/s/articleView?id=mktg.mc_anb_einstein_sto_refresh_preview.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: f2086af16937a591c4cabadf8e522475a595e906f68ddf2e1f872d77d6173967
description: After you create a preview of a data extension in Marketing Cloud Engagement, you can refresh it to find out if Einstein’s optimal send times have changed.
products:
  - Marketing
  - Marketing Cloud Intelligence
release: "264"
---
# Refresh a Send Time Preview

After you create a preview of a data extension in Marketing Cloud Engagement, you can refresh it to find out if Einstein’s optimal send times have changed.

If you build a preview while a different preview is building or refreshing, the refresh process stops. When you delete the data extension that a preview is based on, you can’t refresh the preview.

1. In Marketing Cloud Engagement, select **Einstein**.
2. Click **Einstein Overview**.
3. Click **Preview**.
4. Click a completed preview to refresh.
5. Click **Refresh**.
    
    The preview starts building. You can navigate away while the build is in progress and return at any time.
6. When the progress indicator reads Complete, click the preview to see a graph showing the optimal sending hours that Einstein identifies for this data extension’s contacts.