And they tend to last longer, as opposed to links generated using
automated methods.
But the speed at which you earn links and the speed at which
you have historically earned links can also be factors because,
generally, an abrupt increase could indicate an unnatural attempt to
manipulate ranking.
If you’re using methods that don’t meet Google’s Webmaster
Guidelines, and you have an abrupt increase in the number of
inbound links that trigger a manual review, you could end up facing
a penalty.
This looks natural:
This looks less natural but depending on other factors, such as
recent media coverage, a new product launch, or an amazing
content marketing campaign, it could be completely natural:
HOW LONG DOES SEO TAKE?