Tee Emm, close. The circling area size is designed based from the max speed it's supposed to be flown, probably best to keep within it. I have seen somewhere that went into wind factors and rate of bank etc for these circuits, but can't remember where it was now...:
from a position within the circling area on the down-wind, base or final leg of the landing traffic pattern at an altitude not less than the MDA, can complete a continuous descent to the landing threshold using rates of descent and flight maneuvers which are normal for the aircraft type and, during this descent, maintains an obstacle clearance along the flight path not less than the minimum for the aircraft performance category until the aircraft is aligned with the landing runway