How do I change this timing?

So there's probably a simple fix for this, but I haven't been able to find one.

This bit will subtract 1 from "health" every tick. But how would I control the timing of it?

Say I only wanted to subtract 1 from "health" every second.

just add another condition that says "Every 1 Seconds"

also, it will continue to count down after it gets down to zero - because it will still be less than or equal to 100...

(unless you have code somewhere else to end the game if it gets to zero.)