1/ (For) How long will you have been in this company when you retire? 2/She will have
been in London for 5 years next month.
You could add 'for' at the start of 1. There is nothing wrong with this sentence but this question is by one worker at the company to another. More natural would be ' For how long will you have been working here when you retire?'
2 is fine.
February 21, 2021
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