When I was still a TROM newbie, I remember doing level three for about two weeks and (erroneously) declaring myself finished with it. Then I went onto level four and it (*&^-ing overwhelmed me! So I dropped back to level three for about three months doing about two hours of processing myself each day.
Determining whether or not I was finished with level three was one of the hardest, confusing, Q and A cycles I ever embarked upon.
FINALLY I grasped on to one stable datum about the process from Dennis' books that states something like the process when flat will be virtually impossible to run.
So I just kept running it until I couldn't anymore, and it was as simple as that.
I am now on level four and have no doubts about whether or not I should be there.
If any of you reading this have had similar problems, I hope my posting helps.