'That's the reason why dried flowers can be used for two or three times.'
Is it awkward?
I got wrong because I wrote 'for' in front of 'two or three times'.
(teacher told me that 'That's the reason why dried flowers can be used two or three times.' is answer')
Your teacher is right.
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That's the reason why dried flowers can be used two or three times.
Think of the above as an idiomatic expression.
Note we do say eg That's the reason why dried flowers can be used for the third time.