The Remarketing Slice Size limits additional triggers based on the start of a trigger campaign.

For example, you have a multi-stage cart abandonment trigger, set to send after 30 minutes and 48 hours and your Remarketing Slice Size is set to 120 minutes. You also have a browse abandonment trigger, which is set to send after 30 minutes and then again after 24 hours.

If a customer browsed and carted a product, then left for sufficient time, they would trigger the cart abandonment. If they returned to the site within two hours and browsed more products, and then left again, they would not receive the browse abandonment email because they would be excluded from starting other trigger programs.

If, they returned more than two hours later, they would be added to the browse abandonment trigger. However, they wouldn't necessarily receive the email. Before we send, the system looks at the Contact Remarketing Pressure Interval. If it was set to 1440 minutes (a day), despite the customer being included on the browse abandonment trigger, they would still not receive the email, because sends would suppressed until the remarketing interval (a day) had passed.

If it was a single stage browse abandonment trigger, then they would never see an email, but because this browse abandonment email has a second stage (which is set to long enough to avoid the ignore period), they would receive the second email. This could also stop the second stage of the cart abandonment campaign from sending (because of the Contact Remarketing Pressure Interval).