In my last game, the GM ruled during downtime a number of posts before proceeding to the next event/encounter.  Here an example: a player and I had their characters do an intimate moment in a bedroom of some angel's castle.  GM ruled that we had about 3 posts each before an attendant would come and fetch us for an audience with the lady angel of the castle. And, then jump to the audience scene...  Something like that. It can be a strict set number, or could go little over or less by a couple of posts at most.  This will most likely make players optimize their posts but it's one way not to to get things bog down. down.