What is unusual about how long it takes the jury to reach a verdict? Is the verdict predictable or not?

One expected a racist jury of white men to deliberate quickly and hand down the predictable guilty verdict to Tom. Atticus's arguments actually did touch one person. Mr. Cunningham, the ring leader of the mob, heard the truth and tried to do the right thing. Unfortunately he was outnumbered by the rest of the jury bent on putting a black man away at any cost. Although a child could see that Tom was innocent, the verdict was predictable for that jury at that time in history.