It is not specified in either The Lord of the Rings or The Silmarillion how long it took to forge the 20 Rings of Power.
Chat with our AI personalities
Well, you can just take any ordinary ring that you have and make it a promise ring. This way you dont have to spend a fortune, and you can know that its a promise ring. This page: herpromiserings.com/promise-rings/stores has some shopping tips to get you started.
ten years
In the book it took Saruman about 2 years, but in the movie it seems only like a few months.
two month
From information on lordoftherings.net (see related link for appropriate page), over 1,600 pairs of ears and feet were used. So about 1,600, give or take a few dozen.