there's an app on the iphone/ipod touch app store,it kinda records all your progress and your average credits per day and calculates a estimated time you get to a rank,i have 4 years apperently,dunno if i'll be playing it that long,my mate hasn't been on it for ages and it predicted him 73 years,it's a bungie app,it show's scrrenshots,even the one's not on your file share,use it to challenge yourself!