We have developed a highly target solution for retail integrating WCA, Ecommerce Events, Beacons, Smart Screens and push notifications fired when customers get closer to a smart screen. Our strategy involves sending a push with "30 minutes left promotion" hoping to modify customer behavior, however the publish method for messages only has days/hours expiration options. We would like to use "minutes" in this drop down menu.

Print screen attached here (https://headerinteractive.com/materiais/ibm/ideas/inboxexpirationdate.png)