About tiers and turns...

Every tier includes a set number of turns per month. A turn is one thing you do or say, and her reply. An average playthrough runs 60–90 turns; a long one can reach 130.
In practical terms, 1,000 turns is roughly 15–25 hours of play, depending on how fast you read and type.
New scenarios drop every two weeks, so there’s always something new to try. Scenarios never expire, so there’s no FOMO if you’re mid-way through another one.