1. No. 2.
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New2grammarI've known him as long as I've known him.I'm going to go out on a limb here and say that this is a case of missing context.
1 Is the above common?
2. What does it imply? He knows the person for a long time?
Thanks.
Peaceblinkfriend'I've known Bob (for) as long as I've known Tim'for is optional.
PeaceblinkfriendI assume including 'for' is considered better style in formal writings. What would you say?I don't know. I don't think so.