Backlinks checkers have crawlers which scrap the web regularly and hence they are always behind the web and may take a couple of weeks or months depending upon their speed and capacity as well the popularity of the crawled website. Usually they give more priority to popular or authoritative websites.
Instead of kept waiting for these backlinks checkers to crawl your backlinks, it better you simply upload the list of backlinks from the reports we provide to you.
Indexing your links mean that Google search index these links, and know about it
Backlinks checkers, such as Google webmasters tools or Ahrefs takes a bit more time to show backlinks, after your links indexed in Google search, about 2 weeks and up to 3 months
Google webmasters tools will show just a few of your total links
We believe that Ahrefs spiders is less powerful than Google but it's still faster and should index most of the backlinks but after about 2 weeks and up to 3 months of getting these links indexed in Google search