Serge's first day is pretty straightforward. We see him wake in the morning and follow his actions throughout the day until sunset.

At this point it is not important to list which guide is chosen. All in all it doesn't matter. The newly formed group will depart in the daylight and choose to wait until it is dark to take any further action. Like the last day, this is pretty straightforward.

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I should note that I was initially hesitant to list these events under Day Four. I am still debating whether or not Kid would require an extra day to recover from her poisoning. The game doesn't suggest she spent an extra day in bed for this purpose but it is hard to imagine her being able to fight so soon after receiving the medicine. Also, I can't recall at this time whether the group spends the night in Radius' hut before departing again. If they do, then not a lot was accomplished on Day Four. Instead I have them board Fargo's ship in the afternoon and awake during the night when the real ghost ship arrives.

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Finding themselves in such a strange area, Serge's group was likely very cautious and took plenty of time to explore it.  After leaving Marbule Serge could return to Arni for a well deserved rest.

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After learning that his goal is to challenge the six Dragon Gods, it may seem strange for Serge to immediately help Nikki in performing his concert.  Yet this side-quest must be completed before fighting the dragons if the Black Dragon is to awaken.  Not only that, but it helps to heal the rift between humans and demi-humans. I believe Serge would voluntarily undertake this task and spend the remainder of the evening preparing for the upcoming battles.

Here is where it gets very confusing.  It is impossible for me to judge exactly how many dragons Serge can defeat in a single day.  I don't believe it is possible for him to defeat them all in one day.  He simply isn't that strong.  Then I had to consider how much of a rest Serge would need between battles.  Also the distance between islands must be taken into account since Serge will spend some hours of the day travelling.  If I recall Serge doesn't even know where all the dragons are.  He has general ideas, but he is bound to come across a dead-end every once in a while.  Does Serge's group divide to take on multiple dragons simultaneously?  It would seem to me that if it is Serge who is seeking their blessing they would only be willing to test him, not a group of his friends.  At this point I lean toward one dragon battle per day.  Also, if I am wrong, this gives him a some extra time to put toward finishing up any loose ends should be be done early.  

We don't know for certain when Serge chose to fight Dario, or even how he came across him in his adventures. Most players usually wait until Serge gets his true body back before engaging in this battle. That being the case, I have listed that event under this day. Also, I have chosen to have Serge not rush into the Sea of Eden immediately upon regaining his form.  Knowing full well Dark Serge would be waiting within and unsure of what else he may find, I imagine Serge would choose to depart early in the morning rather than halfway through this day. Instead, the remainder of this day could be spent recruiting new allies and undertaking any remaining sub-quests.

A very long day, if I do say so myself. I would imagine Serge would depart early for the Sea of Eden and spend much of the morning exploring Chronopolis. The dragons would merge sometime in the afternoon (as seen in the cinema) while the group retreats to the S.S. Invincible. The remainder of the daylight hours would be spent forging the Chrono Cross at Divine Dragon Falls and then rescuing Kid from her coma. That night Serge would fly to Terra Tower using the anti-gravity device from Starky's ship. Most of the night would be spent inside the tower and the group would escape in the dawn hours as the tower takes on its final shape (see cinema).

Considering how long the previous day was, Serge likely took a long break at his home in Arni in the morning after escaping from Terra Tower.  After awakening, he could then travel to Opassa Beach to learn of the Time Devourer and Schala. From there he could use the Time Egg, engage the Time Devourer, and eventually free Schala.