From the poem "Because I Could Not Stop for Death" by Emily Dickinson...
Answer to the First Question: The speaker describes in the narrative her short trip alongside what she considers to be a male individual - presumably the Death itself -. The speaker presumes the little journey felt like a day to her, but it actually took centuries. The pacing of the narrative goes relatively quick compared to the real time stated by the reader (centuries), given that she mentioned what one would commonly see on a daily routine along the road (i.e. A school, grain fields, and the sunset).
Answer to the Second Question: The speaker means to express how lightly she takes death (Felt like a day) by comparing it with the patience requiered to endure daily life (Centuries to her). In other words, she considers daily life to be a never-ending routine.
This is evidenced by the quote "I surmised the Horses' heads were toward eternity", assuming the horses pulling the carriage would have taken her through the sight of her daily life over and over again.