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Do badges get calculated in real time, or do they get calculated by an external service? How long does it take for a badge to be awarded, once its requirements are met?

Does Stack Overflow use any external services to do things, like maintenance, e-mailing or badge calculation?

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Regular Badges

A scheduled job; there are a number of scheduled tasks at different intervals (every few (5?) minutes; hourly; daily etc) that do a range of things. Many of the badges are on the "every few minutes" loop...

General rule: Wait at least 24 hours. If you haven't gotten it by then, you probably didn't meet the criteria for the badge. Try checking the list of all badges with full descriptions.

Tag badges

The tag-based badges are calculated on a daily basis at 03:00 UTC, which is when all the tag scores get updated. At that time, any new badges you may have earned will also be awarded.

Again, if you do not receive the badge at that time, you probably don't meet the criteria. Hover over your score to make sure that your stats for the tag match the requirements. Also keep in mind that a tag must have 100 questions under it before it even qualifies for tag badges.

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