Well we don't have one of those fancy bikes that takes into consideration your weight and heart rate and stuff, but it takes me about 30 mins averaging 25-30km/h for it to get to 500ish. If i'm going 20-25km/h it takes closer to 35 mins. I'm sure that for me it's actually less than 500, but I still like to see that number come up. I"ve actually been using the app 'my fitness pal' to keep track of my calories and stuff. You put in your exercise there too.