That's from emergence to death. Approximately the first 21 days they spend as house bees doing clean up, nursing, nectar transfer, guard bees and so on. The next 21 days (approximately) they spend as foragers. Of curse, these time frames can change depending on the needs of an individual hive at any specific time. In winter they live longer for two reasons: metabolism changes, and they don't wear themselves out flying 1,000s of miles.
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