Rashi on Deuteronomy 10:10/רש"י על דברים י׳:י׳

1ואנכי עמדתי בהר AND I REMAINED ON THE MOUNT to receive the last (second) tablets. — Since it does not state above (v. 2) how long he remained on the mount at this last ascent, he begins again with it (with that incident).

2כימים הראשנים AS THE FORMER DAYS — those of the first tablets. How was it with those? They were passed in God’s goodwill! So these, too, were passed in God’s goodwill. But the intervening forty days when I remained there to pray for you were passed in God’s anger (Seder Olam 10; cf. Rashi on Deuteronomy 9:18).