The length of the articles that are added is based on the quality of the auditorial. Mainly the premium editorial articles are 600 words which is a good and effective length. Some other sites also offer an option to post 600 to 800 words at a time for a single article. The selection of the words will be based on the sites and the editors. The trial can even be given to the lengthier article if you finally choose for the cost that will be greater than the normal one.
For a single article, the permission to add a single link is only there. But if you wish your post to look completely natural and non-promotional then adding several high authority non-competing links to the posts will be a suitable option.
The complete work is done with the upfront payments, especially with the premium editorial links. You will get the assurance that the results that you will get will be as per the payment that you have made for the respective services. Due to any reason if the satisfaction is not there then the total amount will be refunded for future assistance.
The time taken in the completion of the process is about 1 to 2 months; the exact time will be based on the site that you choose. Some sites take less time while others take even more than 2 months.
Yes, you can but there is some situation that makes the situation to change the URL and anchor site it gets posted on might not give the acceptance to certain links and the available anchor texts.