Est run time: 15-25s.
Usefulness: Whether it's a blog article with rankings, a review site, or a random directory, having a presence on "Top {{keyword}}" lists is great for discoverability. At the very least, it's something you can brag about at parties. Assuming you get invited to parties, of course. It's been years since we've been. Our friends say it's because of all the listicle bragging we do, but what do they know, they're not on a single listicle.
Caveats: Not all results will be relevant, especially as you go down the list. If you have a generic brand name, the brand match will likely be incorrect. For industry, pick the one you most identify with.