I wonder if it is possible to do the freedom islands and do not return there later, just in 1 day ... You will lose at least 2 quests (anga's ruby and the embassy recapture) but this probably will lower the fastest time to 9 days. In my game I have like 6 hours left and I still Need to kill Duke Sov, Kraken, the orcs in The Boot and either the Wild Duke or Manno. I'll try but don't have much time to play right now ...
Edit: It may be possible but I did some calculations with the score formula:
(100 + 91*4) * 3.62 = 1679,68 (9 days, 101 quests)
(100 + 90*4) * 3.66 = 1683,6 (10 days, 103 quests)
This proves that finishing the last 2 quests and losing 1 day for it, is worth it in terms of score. And probably this is the highest score you can get in the game with the current rules, and without cheating
