currently count() is not a time based function, but it's nature + ability to check a timeperiod would benefit from being a time based one.

for example with a trapper item :

count(600,1)<3

0 seconds - value 1
30 seconds - value 1
60 seconds - value 1
1200 seconds - value 1

we would not detect the problem condition unless another value comes in sooner. if count() was time based, we'd detect the problem after 660 seconds or so