They’re two different units — “minutes” describes time used while “credits” is what you’re billed — so to convert you need the credits-per-minute rate for the specific model/feature you used (this rate appears on your pricing/billing page or in the dashboard tooltips). Conversion is simply: credits used = minutes used × credits_per_minute (adjust for seconds if the rate is per second and for any rounding or free allowance). If you can’t find the rate in the dashboard, look at the product/pricing page for your plan or contact support and provide the date/model so they can tell you exactly how many credits correspond to those minutes.