How do you use SPADELAY?

[stranf]

How does SPADELAY work?

As I understood it, it was how many second delay there was before the NPC casts a spell.

Well, I'm working on tweaking the reapers and I have them set with a SPADELAY of 3, and a spattack of 7.

It would seem 10 seconds or so before the reaper would attack.

I tried SPADELAY of 1, and a SPADELAY of 150. No difference.

I even tried SPDELAY of .0000000001, and still it seemed to cast a spell once every 10 seconds if I was lucky.

What am I doing wrong?