Everyone threshold is different. Someday, I would spend half a Saturday doing water change, clean the glass, skimmer, change out carbond, gfo, wife down equipment, etc... And I feel like it's not a lot of work. Someday, I don't even want to pick up the fallen coral.
These blackworms do need some attention. The least amount of work I do for them is change the water using tap after a week. The most amount of work I did was change out the water with RODI after 2 days.