Recommendations
A practical starting range for pork shoulder in the oven is 225-300 minutes at 177°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, whether it is covered, oven temp, so treat the range as guidance rather than a guarantee.