We are currently running a 3 hour publishing cycle and 15 minute transfer cycle. The following diagrams and video times may be slightly off.
Here's a video from our T4 Developer video series "T4 Dev Insights" regarding publishing:
The following diagram demonstrates the workflow involved in editing, publishing and transferring content from the T4 application to VCU's servers.
The following diagram illustrates the cycling publish and transfer schedule. For a great video explanation of this process checkout episode 8 of T4 Dev Insights.