When a narrative has more to offer than a one-shot can handle, but not so much as it would require more than half a dozen or so sessions, a mini-series of the campaign would be hosted; the most popular mini-series I could point out would be the Dimension 20’s Side Quests, as well as Critical Role’s Exandria Unlimited. These examples have short-form stories that conclude within four to eight two to four-hour sessions.