Past Simple/Present Perfect-Can I omit "for"?

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Lecword

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Mar 21, 2014
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Spanish
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Spain
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Spain
Hello

I need to know if "for" can be omitted in these sentences, in a formal context:

We worked in that company (for) six months.
We have worked in that company (for) six months.

Thank you
 

Rover_KE

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Jun 20, 2010
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