You want to go from a 60 second cycle to a 100 second cycle.
Based on your existing code, you can use something like:
=IIf(DateDiff(DateInterval.Second, Today(), Now()) Mod 100 >= 80
AND DateDiff(DateInterval.Second, Today(), Now()) Mod 100 <= 99
, False
, True)
You get a 100-second cycle by taking the number of seconds since the beginning of the day of the Modulo 100. Then you can break it into buckets of twenty in your expression, and not into buckets of 12.
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