With pre-knowledge of the quests, a week or two of resource building and scouting, and again having the luck of just starting a new chapter, so having a lot of room for temporary buildings, plus a couple of instants, I was fully prepared for the quests.
Since there were no double days, there was no incentive for opening chests on a particular day for the set. I decided that my main goal for the dailies was to collect crafting wisps, for which the best daily was today's Elven Float at 3x5 squares.
My plan was to save all my candies for today, day 6. In the sequential quests, I was up to #67 at the start of the day. I have just completed the final, #85, with 5 hours to go.
If my notes are accurate...
I have spent all my candies earned so far today, 2,791.
I opened 82 chests, receiving 750 bonus candies (+27%), for a total of 3,541 candies.
I received 143 flags, earning the first 7 Grand Prizes (4/5 set buildings).
I also won 10 Elven Floats, for 150 squares of disenchantable building, worth 13,500 Wisps at my current Level 3 Magic Academy.
At 143 flags from 2,791 initial candies, that's a 19.5 candies/flags return.
That leaves 15 days of 35 candies daily quests plus let's say 25 candies pickup, for possibly 900 more candies, with 37 flags to go, so attempting 24 candies/flag return.
I should be able to get GP8, the Carting Library, probably not the Jester's Tavern setpiece 5/5