This is not my colony, but I do play very large colonies. The answer is in the numbers; if you have enough colonists set to do the same job, it will get done. The only problem is that things like workbenches get reserved. So workers with a specific task, like cooks, get assigned a bed near their work spot, because all the time they're travelling to their stove, it's reserved and can't be used by other cooks. All goods they require to do their jobs are hauled in by other colonists