ISB ~ 2 Peter 3 v8

one day … thousand years:A reminder that God’s plan will unfold according to his timing, not ours. In point of fact, the Lord is being patient—not procrastinating—when he holds back his judgment long enough for sinners to repent (3:9; Rom 2:4).

• Peter is alluding to Ps 90:4, which contrasts the eternal perspective of God, who stands outside of history, with the brief existence of man.