at your earliest convenience
US /æt jʊər ˈɜrliɪst kənˈviːniəns/
UK /æt jʊər ˈɜrliɪst kənˈviːniəns/
1.
as soon as you can; as soon as it is convenient for you
:
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Please reply to this email at your earliest convenience.
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We would appreciate it if you could send the documents at your earliest convenience.