Setting a delivery time for your products on Amazon is done in your Amazon seller dashboard. You do not do this in EffectConnect.
You do specify the processing time for your order in your channel settings within EffectConnect. For example, whether you're going to process the order within 1 or 2 days. However, this is separate from the delivery time the customer is promised. You really set this in your Amazon seller dashboard.
If you have any questions about this, we recommend that you contact Amazon's partner service.