Recommendations
A practical starting range for roasted cauliflower in the oven is 25-45 minutes at 204°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 doneness with a skewer test, texture check, or other reliable visual cue.
The result usually shifts most with piece size, crowding, fan or convection setting, so treat the range as guidance rather than a guarantee.