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There is no specific time limit for communicating such a decision but it must be a reasonable time limit.
If the employer can give a good reason why it should wait 3 weeks to announce the decision it would be accepted.
The reason could be that they wish for both of you to be present because of the type of decision made. That it needs to be explained to each of you or would require both your participation such as a face to face mediation/ reconciliation etc.
If there are any further points please reply I will be happy to respond
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