Plenary Law and Legal Definition. Plenary means characterized by being full and complete in every respect. For example, a plenary trial is a full trial of all the issues, factual and legal. Sometimes when a case is heard on appeal, the hearing is limited to only questions of law.
Report Abuse. It normally takes 4 to 6 weeks for a paper return to be processed. This year may take longer and particularly in your case. The IRS may not start processing your return until Feb. 23rd. Congress put some unusual demands on the IRS with the late law changes and they are struggling.*.
It could take them up to 120 days just to return the form so four months was wasted on nothing. If the correct form is used but it is not completed correctly then they have up to 120 days to request the corrections.art of that is due to the transition. There is no way to give an exact time on how long it will take, but one thing that greatly affects the time is if the correct forms are filled out right the first time.