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How long does it take for queen bees, worker bees, and drones to develop into adults?

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bees on a honeycomb — Beekeeping Bees on a honeycomb.

In the context of beekeeping, the development time for honeybees varies by caste. For all three forms—queens, workers, and drones—the eggs hatch after three days, after which they develop into larvae and eventually pupae before emerging as adults.1

The time required for each to reach adulthood is as follows:

Queen bees: 16 days1
Worker bees: Approximately 21 days1
Drones: 24 days1