Analysis of information sources in references of the Wikipedia article "Tehanu" in English language version.
Between the last chapter of The Tombs of Atuan and the first chapter of Tehanu, twenty-five years or so pass, time enough for the girl Tenar to become a widow with grown children. Between the last chapter of The Farthest Shore and the fourth chapter of Tehanu, a day or two passes, time enough for the dragon Kalessin to carry Ged from Roke to Gont.
Tenar (the young priestess of The Tombs of Atuan...), now the widow of Farmer Flint, adopts a young child (Therru) who has been viciously abused and maimed by her own parents.
Between the last chapter of The Tombs of Atuan and the first chapter of Tehanu, twenty-five years or so pass, time enough for the girl Tenar to become a widow with grown children. Between the last chapter of The Farthest Shore and the fourth chapter of Tehanu, a day or two passes, time enough for the dragon Kalessin to carry Ged from Roke to Gont.