I did 2 things. Plan your actions to minimize travel. For an example first visit to the Elven lands i had to leave most of the undead world unfinished, because my flight was leaving

(i spend almost exactly 24h on that first visit) But make sure to get the obelisks. On the second and final visit i cleared that area + maze + Murok in 16h. And i also did 2 trips to Freedom Island. I dont think you can clean it on your first visit in 24h anyway, and coming back with huge leadership and better troops helps alot.
Day 1-2: Start clearing everything in Darion. I went for the quest first that gives the free ship and picked banners and treasure before even doing a single fight outside the Training Hall. On Day 3 before 7am with lev 5 i went to kill the turtle(the travel back should happen shortly before 7, or you waste alot of time).
Day 3: Kill Turtle, do more stuff in Darion
Day 4: (shortly before 7am) travel to Freedom Isles. Run around pick up all treasure, runes, banners.
Day 5-6: defeat Redbeard, get Maps and return to Darion (shortly before 7am

), rest of the day clean rest of Darion and pick up everything thats not nailed down in Kordar and Demonis. I was Lev 11 with 8k leadership at the end of Day 6, also got 5 Giants and max level target (i think if i had gotten the castle in the mines, ork embassy retake quest would have been available, made a mistake here) It may be better to try squeeze this into 1 day and do the rest later, but not sure. I wanted the whip
Day 7: Travel back to Freedom Islands (before 7 am). Spend the rest of the day killing everything including Kraken.
Day 8: Return from Freedom islands (before 7) Clean as much as possible in Kordar.
Day 9: Travel to Ellinia (before 7) and do as much as goes into 1 day. (make sure to get all obelisks, so on the last return to Kordar you can finish the Obelisk quest)
Day 10: Return to Kordar/Darion(before 7) finish everything including Demonis. (i made sure to have Sprites and Dryads in my Reserve slots, so i could carry more than my Leadership allowed, since i would get more soon)
Day 11: Return to Ellinia(before 7 of course). Finish undead area, Maze and Murok. I somewhat cheated in the Maze tho. On my way back to turn in the Incarnations quest i saved and if i made too many mistakes picking the path i reloaded. This wasnt really necessary, because i already had the final fight troops (Knights and Horseman in Reserveslot) with me anyway, but i wanted that Quest too. And it was very close in the end.
And my offer again, i can provide all savegames (83 this time). I also stuck with my 1 wife policy (Feanora had the perfect slots and bonus anyway) In addition to that i didnt purchase a single scroll in the game (thats why i ended up without resurrection but i wouldnt have used it anyway)