Klaviyo recommends sending your first abandoned cart email 2-4 hours after someone starts checkout, with their pre-built flows defaulting to a 4-hour delay.

Here's what you need to consider:

Standard timing recommendations

• First email: 2-4 hours after cart abandonment
• Second email: 20-48 hours after the first email
• Default in Klaviyo templates: 4-hour delay

Platform-specific considerations

Your ecommerce integration affects timing:

Shopify/BigCommerce: Data syncs quickly, so standard timing works well.

Other platforms: May sync data less frequently (often hourly), so:

• Set minimum 1 hour 15 minutes delay to accommodate sync timing
• For platforms like Magento 1 (syncs every 30 minutes), use at least 45 minutes

Business-specific factors

Consider your product type:

• Quick decisions (shoes, accessories): Shorter delays (2 hours) may work
• Considered purchases (mattresses, electronics): Longer delays (4+ hours) prevent seeming pushy
• High-ticket items: May need even longer consideration time

From our experience:

The 4-hour default works well for most businesses because it gives customers enough time to complete their purchase naturally while the cart is still fresh in their mind. Sending too early can feel pushy, while waiting too long reduces urgency.

How to create an abandoned cart flow | Flow sending frequency optimization