- At the start of Book 15, Pluto is recovered and the Shadeborn returned. The Solars, exhausted, return to the Sunlands.
- Lucent goes inside Varanim's mindscape to heal her wandering Po Problem.
- Lucent and Varanim return, and have some more medicine classes.
- Returning to the Sunlands, Lucent becomes Adagio and takes Zahara to the Lapis Court. The whole affair takes about three days.
- In the Lapis Court, Zahara finds Riordan, and Lucent finds the Sisters, who become their vassals.
- Varanim delves into the book and the scarf, hearing the Green Lady's words.
- Imrama is currently tripping balls.
- Zahara and Lucent return.
- Zahara allows Varanim to attune herself to the Cascade.
- Lucent and Zahara go to the Summer Palace, and see plays. They are nice to each other.
- Cerin goes into Zahara's dreams and learns just how broken she is.
- Lucent and Varanim sleep together.
- Lucent and Cerin go to the Golden Chrysanthemum and learn of Lilith's culpability.
- Cerin returns to the Underworld to steal items for the doctor. Varanim talks to Piercing Ivory. A day coming and going, thanks to Nim.
- Returning, the Solars get together and Imrama is healed.
- Lucent's cathedral is turned into a veritable Vatican. The whole affair takes about a week.
- Spring returns. He talks to everyone. He teaches Lucent and vice-versa; the whole affair takes a few days.
- Zahara is working on Lucent's balls.
- Cerin goes to An-Teng. Assassinations ensue; the whole affair takes a couple of days.
- Lucent talks Varanim into the Crow deal. Later, he sends maids to her room. She goes fight him about it, it gets awkward.
- Spring begins to asssist Varanim in the treehouse, as do Zahara and Verbena. At a guess, I'd put a week here too.
- Luccent befriends Imrama for real. Zahara and Imrama do the same. He talks to Varanim about going to Lytek.
- Spring offers Varanim her book. He also begins mending the Garden he planted with Zahara.
- Lucent and Zahara meet Fierce Red Star and learn of Zinobia; she sends gifts.
- Few days later, Lucent and Varanim begin their secret affair. They talk via rings like teenagers in love.
- Spring begins recruiting doctors.
- Cerin and Varanim begin hunting for ghostly spies, and learn of Spectre Hives within Solaria's Underworld shadow.
- Lucent cuts his Melee away. He snuggles with Varanim, saying things that get her to want a breakup.
- Spring coughs out Innocence, they learn about Kai. He also goes inside Varanim's Hearthstone.
- Lucent begins shows of light telling their stories, sets the creation of a book based on their exploits.
- After a talk with Imrama, they go south, meet the Maw, Lucent gets the Testament armor and finds his Tomb.
- Few days after the trip to the South, Lucent and Varanim talk to Crow, and break up.
- Lucent finally gives the paints to Cerin.
- Varanim talks to Spring about the breakup.
- About a week later, Varanim limit breaks and pushes Lucent into it as well; he throws Varanim out.
Looking at this, I would think we have something like a month going on. It certainly has at least two week-long stretches, and many 2-to-3 day-long tasks. Even with great mobility given by Agatae and Airships, it would take a little while... it can be two months, but strangling it all in comic-book time, I would say a single month.
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