I can't find the information I'm looking for to make my project work

I'm trying to make an item that acts like the bow except on a much larger range, how the longer you hold it down the more power comes out of it, but my solution to the issue isn't working for some reason. I know how to make it work with the default bow values and I mostly figured out the duration dependency, but it wont work on duration because the item trigger I need doesn't have it. it does, however, have time, so I'm trying to figure out what it does. I checked all over the wiki and forums but I can't find out anything on it. other solutions that do the same thing are also welcome