Answer by Christo Thomas Jose:
- It all depends upon the competition of the keyword you are using.
- You can allocate a maximum of 5 keywords, but this also depends upon the length of the article, say 500 word article.
- It should be done on whole website, not excluding alt image and image title too.
- It depends upon the rank of the keywords right now + your job hours + the platform you are using for SEO (Like directory submission, article submission, blogging etc.)
- I would prefer a team of 5, each concentrating on 20 keywords.