You can do that in your Configurations tab on the APM page (for customers who have APM). See the steps on how to go about it below:

  1. On your dashboard, go to 'Curate Reviews'

2. Click 'Setup' under 'APM'

3. Edit the days after which you want email requests to go out here:

4. You can also decide if you want the emails to go out after purchase, or after fulfilment, or after shipment