For how long has Gulliver been in his circumstances by the last chapter?

In the last chapter of "Gulliver's Travels," Gulliver has been in his circumstances for 16 years and 7 months. This duration is critical to understanding Gulliver's overall journey and the transformation he undergoes throughout the narrative. By this point, Gulliver has experienced a wide range of adventures and encounters with various societies, each of which has contributed to his disillusionment with humanity.

The specific time frame enhances the gravity of Gulliver's discontent and alienation from human society. After years of exposure to the different cultures—especially the conflict and moral dilemmas he faced in Lilliput, Brobdingnag, and the floating island of Laputa—he ultimately finds himself perceiving humans as vile and corrupt. This maturity in his perspective is reflective of the long duration he has spent contemplating these themes. The detailed time period of 16 years and 7 months encapsulates the extensive personal development and the philosophical inquiries that mark his travels and culminate in his intense misanthropy by the end of the book.