Describe the conditions of the boxcars and the length of time spent in them?

They are ordered to board the boxcars. Hannah asks Gitl how they could all possibly fit in there. Gitl says that with God's help they can. They are crowded in and the doors to the boxcar are shut, triggering panic and screams.  Hannah is thankful to be close to a pocket of fresh air as the stench of perspiration and vomit begins to build inside the tiny boxcar. The train ride lasts for four days and nights.