Gulliver's Travels : Brobdingnagian (Chapter One)

In the first chapter of part two, two months after his return from Lilliput, Gulliver sets for another voyage. But in this website the duration between his stay after returning from Lilliput and going for another voyage has been given 10 months. I am using a Oxford University Press publication from the series Oxford World Classics. Please help to clarify this question.