Recommendations
A practical starting range for pork tenderloin in the oven is 20-27 minutes at 218°C. This page is built to answer the cooking-time query fast without burying the useful part under a long recipe story.
Use the clock as guidance only and confirm an internal temperature of at least 63°C when that safety target applies.
The result usually shifts most with weight, diameter, seared vs not, so treat the range as guidance rather than a guarantee.