Adam Clarke on Ezra 7:8

He came to Jerusalem in the fifth month - From the following verse we learn that Ezra and his company set off from Babylon on the first day of the first month, and thus we find they were upwards of four months on their journey. They could not travel fast, as they were a great company, composed in part of the aged and infirm, besides multitudes of women and children. They appear also to have taken a circuitous route. See on Ezr 8:24-32 (note).