Kerdi Fix is the Bomb.
I think from experience it cures more like 1/8" per day.
We can leave KErdi Fix out overnight and then just pull the cured tip away. Most days it only cures about 2-3mm or 1/8".
I guess the larger the void the faster the cure.
Jim I'm told by a client in Chicago that Kerdi DS is for sale in the US now. Did you get to see any of this?