avoka
When you turn 45 degrees and fly for 30seconds that also needs to be adjusted if winds are strong. That takes care of circling radius. Below from airbus document
Not for those who consider everything other than what they know as abstract document)
5.4. Timing for Circling:
The timing Airbus recommends is 30 seconds from wingslevel, adjusted for strong Head or Tail wind, by reference to the ND windindicator. However, this is a visual exercise: Timings are approximate only.
Blogs, I have to disagree with you about going down to 400ft. It is not a question of terrain clearance but obeying the circling minima. You cannot descend below minima to fly level. You can only descend below minima during the final turn