It only takes long because a lot of people are doing it manually, and submitting them one at a time.
I am all for doing things the lazy way.
You can submit to 48 top sites with Social Marker all at once. And it's a completely free tool.
You just have to set up with the sites the first time through social marker, but once you do that, it's pretty much automatic every time after that.
I'd have thought this was what most people were using already, but it doesn't seem the case.
Hope this helps.