four years for manslaughter. Paroled for good behavior
The turtle plods along on its way with purpose and tenacity despite encountering many difficulties and set-backs, as will the Joads and the other migrants.
He is establishing Tom as a person primarily concerned with only himself and his own well-being.
The best part of the novel is the one that says- Night found him leg weary with hands and face lashed by the branches. that explains and supports the idea