John Wesley on Ezekiel 4:6

Accomplished - That is, almost accomplished. House of Judah - Of the two tribes. Forty days - Probably from Josiah's renewing the covenant, until the destruction of the temple, during which time God deferred to punish, expecting whether they would keep their covenant, or retain their idolatries, which latter they did for thirteen years of Josiah's reign, for eleven of Jehoiakim's, and eleven of Zedekiah's reign, and five of his captivity, which amount to just forty years. But all this was done in a vision.