If your online post sending has multiple cards in it, you can optimize the display time per card depending on the content of the card.
For pure photo cards we recommend 5 seconds.
If the first card is just a fun or beautiful cover card with simple content, 3 seconds can also be sufficient.
For a card with a lot of text on it, we recommend 1 minute.
The default display time is: 30 seconds
Best is to play around with the display time and view your test emails a couple of times.