דברי הימים ב, פרק ח׳, פסוק א׳

A long and significant era of national building defined the early years of Solomon's reign. This massive undertaking spanned twenty years, finally reaching its conclusion. Rather than a single continuous project, this timeframe combines two distinct phases of construction: seven years dedicated to building the House of God, followed by an additional thirteen years spent constructing Solomon's royal palace [רש״י].

For two full decades, Solomon was actively engaged in raising these monumental structures [ביאור שטיינזלץ]. The milestone noted at the end of this period goes beyond simply describing the ongoing labor. It marks a definitive end to the effort, highlighting the fact that Solomon had fully and successfully completed all the construction [מצודת דוד].