I just started playing the Shattered Star adventure path under a new GM, and as I sit with my copy of Ultimate Campaign dreaming of building a Mage Academy and a horde of loyal followers, I was suddenly struck by reminiscences of other APs where the action is rush-rush-rush and you go from level 1 to 15 in about three weeks of game time.
So, before I pre-plan my mighty business empire I ask those of you who know - is there much downtime in the default Shattered Star? Would it be easy enough for my DM to write some in? There's one other player who loves the sort of paperwork required in running an off-screen business, and a couple who'd probably appreciate the time to craft or commission custom magic items, but we wouldn't spend much table time on it - we'd do it by email.
My group is currently nearing the end of book 2 for shattered star, and we've had a good amount of down time. A majority of the path so far has focused on dungeon diving, so while you are in the dungeon, there won't be downtime, but our GM gave us a good amount of down time between dungeons.
We are also using the UC downtime rules, and it's been good so far. One of us is building an Inn that is becoming a base of operations for us, and our oracle and sorcerer do a bunch of crafting.