Not sure where you are getting the three month portion. It might take a few days if you dedicated the time to it to analyze it, maybe longer for those who are bad at math/excel. That said, if ACT were suddenly not to exist, the people behind such things would likely do as another suggested and create a browser app/prebuilt excel sheet for you to just copy/paste the information into and get an immediate response. Sure, you can't see it mid fight but uh.... no one looks at that stuff mid fight. If you are looking at your parse during a fight in any game it means you aren't paying attention to the fight and there for reducing your DPS. Thus it would be used in the exact same way as a browser app would be, and said browser app would be completely immune to any 'anti-cheat' system or detection.