yes.. you can definitely add unnatural links in the disavow tool. The tool won't tell you how long it would take to remove all the links. I guess it would take weeks before you can feel the effect on your site. We did found some success with it since late last year.

It will take anywhere from 3 weeks to never.

Disvow tool doesn't work. Remove the links or sit around pondering if the disavow tool works, your decision.

Go on forums like this one and all the other SEO forums and you'll see that no one has success with disavow tool. It's created just as a source for Google to find more unnatural link sources and penalize websites, nothing more.

I have used the disavow tool for the past year. It usually takes about 2-3 weeks...and at times...NEVER .

what is disavow link tool? And what does ths tool work? And what is unnatural link?

It would not take more than 1-2 weeks, if you are uploading in preferred format.

I think you must be aware about this one. http://goo.gl/hhN1A1

It will take up to 60 days but you get your results within 2 week

Forget the Placebo Tool and just start fresh.