Which preposition is correct?
These pictures she painted for a month.
These pictures she painted in a month.
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These pictures she painted for a month.
These pictures she painted in a month.
Both are correct but they have different meaning.
These pictures she painted for a month.
She spent at least a month painting these pictures. She may or may not have finished the job in that time.
These pictures she painted in a month.
She completed the job of painting the pictures in no more than a month.
(side note: In most contexts, these sentences would sound more natural as "She painted the pictures [in|for] a month.)