Commentators agree this verse counters scoffers who see the 'delay' in Christ's return as a broken promise. The point isn't a literal math formula, but a profound truth: God is eternal and doesn't experience time as we do. What seems like an impossibly long wait to us is like a single day to Him. As one scholar notes, from God's perspective, it was only 'the day before yesterday that Christ died.' His promises are not forgotten; they operate on a divine, not human, timetable.