hhmmm, interesting. Community work is needed in great quantities, but you can't rush it. You can add more residences, you can boost it with higher culture, but you can't instant it in any way as far as I can see.
Thus, with space at a premium, a high culture boost becomes important, and the strategy of using the Great Bell Spire/Crystal Lighthouse, combined with Watchtower Ruins, and Lighthouse of Good Neighbourhood, would prove useful in this chapter.
I have none of those three, so will see how I go.
With regular production per day of 96 per Magic Residence, and 16 Magic residences, it would take 33 days to earn all the Community Work needed. But given it is needed for both research and constructing buildings, and production, it is a constant balancing act. And it means production can't be concurrent while you save for the buildings and research, so the timeline drags out.
I am already fed up with the 2hr productions again, I had hoped that was the number one lesson from the earlier chapter which had it, don't do 2 hr productions!