So they wll not be ~ literally~ seated for a Thousand years only a ~part ~ of the thousand years?
Now you are reading something into the text. The text makes no such interpretation. So it isn't literal after all. OR IS IT ONLY HALFWAY LITERAL? In other words, the text is literal when they are sitting on the thrones judging. But when they take a coffee break, or go home to bed then they are no longer literally sitting on the thrones. If they only put on an 8 hour day judging, well probably by that time the work week will be only 20 hours, so they probably only work 4 hours per day, therefore "the sitting on thrones" must be only one sixth literal.
Come on xzins - you can't have it literal and non literal at the same time. Either they are literally sitting for 1000 years or the "thrones" are symbolic of something else.
Furthermore, there is no reason for judges to exist during the 1000 years. For Messiah Jesus has everything under control with his rod of iron. Or is this going to be a police state where obedience is rigidly enforced or else?