I must have a prodigious quantity of mind; it takes me as much as a week sometimes to make it up.

Summary

This quote humorously suggests that the speaker possesses an extensive amount of mental capacity. It implies that decision-making can be a time-consuming process for them, as it can take up to a week to come to a final conclusion. The use of the word "prodigious" emphasizes the speaker's belief in their intellectual capabilities, highlighting their sense of superiority or uniqueness in their thought process.