Android :: Get Rid Of Last Few Long Calculations In Game

Like the topic of the thread says. In my game I would like to turn all the calculations into FP format. I can eliminate pretty much everything else but I still need to do the the following calculation in long format.The value I get from this is the time passed since last frame, which is like.. two digit millisecond value, which naturally is more than good for FP stuff. After that calculation I turn the resulting value into FP integer and use it with the rest of my calculations but I'd like to get rid of that long calculation too. Any ideas how to go around this to do it in FP format?So any advice how to keep the same "accuracy" of the timer but get rid of the long calculation and have it replaced with nice and fast FP calculation. Any advices on how to trim down the System.currentTimeMillis()