How many times?

It is perhaps the acute seriousness of Israel’s sin and the extensive dialogue between YHWH and Moses that make Exodus 32–34 the most detailed and intense treatment of intercessory prayer in the entire Old Testament. Moses is said to have interceded four times on behalf of the sinful people in order to save them from YHWH’s destructive wrath and to reconcile them to their God (Exod 32:11–13, 32:30–32, 33:12–23, and 34:9). The theme of Moses’ persistent intercessory activity pervades the entire narrative.—Standing in the Breach, page 84