The one I have has a leaf span of 12 inches. I guess I'll have to wait quite
a bit then..

I think another 3-4 years is a good expectation. 30-36 inch leaf span is about
when you should see flowers.

The giveaway usually is a swelling at the base of the growth. Once things start
to get very fat down there, it usually means a flower spike is developing.

FWIW- 12 inch leaf span on kolopakingii 3 years out of flask is pretty good.
You are obviously keeping the plant very happy.

Take care,

Tom.