winweb: How many times should you repeat a key phrase on a page?

Nobody knows for sure, but in opinion of most SEO experts, keyword density for most important keywords shouldn't be more than 3-4%. There are many free keyword density tools online. Once you write about 30 articles and check keyword density for all of them, you will soon have that in your blood and won't have to check density never again.

3-4% is way too high these days!

If you write an article about very specific niche, it's hard to make keyword density below 3% for most important keywords.

2-3% keyword density is was the way i was taught to write proper SEO articles.

Not more than 3 to 4 times.

mostly you can repeat same word or phrase 3 to 4 times...