The Drell campaign has a very specific story arc attached to it, and one way or another, we're approaching the first major ending - the rescue of the kidnapped citizens.
Once that arc is complete, I plan on taking a short break, of perhaps a month, then restarting for the next part of the story. Everyone who wants to rejoin is welcome, and depending on how many come back, maybe add one or two to bring the numbers up. If everyone rejoins, it won't matter.
The 'downtime' phase will last about six months, all through winter. As (I think) Rallyn pointed out, the weather this far north and this time of year is rather bleak and singularly cold and frozen. The next set of adventures will probably all take place on the main island of Drell, and indoors, and be a far less wilderness-related set of occurrences. That'll give everyone a chance to truly enjoy spring in Drell... and maybe find out about the missing Yodwin and the first night's events at the library.
I think a slight change in the type of adventure would be interesting. While I like what's been going on so far, I would like to be adventuring in locales in which giants weren't commonplace.
By the way, Zhure... any idea of just how many story arcs there are? How long do you anticipate this campaign lasting?