Gerund or Infinitive (in this sentence)?

English as a Second Language English Vocabulary, Grammar and Idioms
1

Which sentence is right? Is there a grammar instruction for it?

  1. The ideas are good, but you may need to spend a little bit more time fine-tuning all the details.
  2. The ideas are good, but you may need to spend a little bit more time to fine-tune all the details.

If both are correct, are there any differences in their meaning?

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2

I think both sentences are OK. There is no practical difference in meaning.

There may be a subtle difference between the sentences, but nobody is going to think that hard about it. In practice they will interpret both sentences exactly the same.

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3

Though there is not much difference (except syntactical), I would recommend the infinitival construction.

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