So 8 or 9 feet, I'd say... - Edit 2
Before modification by Shannow at 15/12/2009 02:08:13 PM
WH (To lose the sun) - Cadsuane herself, garbed in unrelieved dark green, sat easily on a tall horse with a black man and tail, maintaining the weave that made the gateway… Nesune Bihara, all in bronze wool, rode through the gateway looking around as if trying to see everything at once, and then Elza Penfel …
That's quite large for someone of her strength. However, if angreal make gateways larger then it contradicts the whole concept of gateway size being linked to your potential, since angreal don't increase your potential, just the amount of Power you are able to hold.
Although, since the women rode through in single file, it might be that Cadsuane made the gateway higher but narrower, thus reducing the overall size in square feet.