How to write expression similar to the TimeEq Function in OsiPI

I am trying to write an expression that gets the time throughout the day when a feeder is both on and the feed rate is above 90%. I have the tags for the speed and on/off already in ignition. I have used a historian function TimeEq in OsiPI to solve for this, but I was wondering if there is a way to write a similar expression in ignition as we don’t have a historian node at this site?