What about the study schedule that is implied in the description for purchasing the premium study package? It says we get "detailed controle over your vocab lists and study schedule," which seems to imply some recommended study regimen.

"Get unrestricted access to everything on Popup Chinese: download our shows to your mp3 player, customize your transcripts and testing tools, and get detailed control over your vocab lists and study schedule. You will make incredible progress while having fun or your money back."