I believe it goes back 999 of the top keywords so plenty of data for the tool to be practical. It's useful for people with sites to come up with a reasonable nu

I believe it goes back 999 of the top keywords so plenty of data for the tool to be practical. It's useful for people with sites to come up with a reasonable number of content suggestions each week/month. It's probably not suitable if you're looking to do a huge volume, but I suspect that wasn't the original purpose nor what the majority of users need.