Social Autopilot will posts new products in 30 minute intervals on the hour and half hour (:00, :30) and during the specified time period of the day.
The definition of a "new" product, is one that is created within the past 24 hours. A product created at an earlier date, set as hidden, and then changed to visible is not a new product.
Of the new products, it will post one at random, and only once.
As an example, if you have it set to post all day long, the maximum number of posts is 48 (2 posts/hr for 24 hours).
If you add 20 new products, 1 random product would post. 30 minutes later, one of the remaining 19 products would then be posted. This would continue for 10 hours, after all products have been posted.
Same scenario, but this time 100 new products are added. 48 random products will be posted, one at a time and still at 30 minute intervals. The remaining 52 never appear, reaching more than 24 hours since creation date.