How many calories am I really burning on my bike machine?

[BoomBoomBoy]

I went on my for about an hour an it said I lost 600 calories, I've been to the gym an that number just seems redonkulous, even if my home bike machine seems to have more resistance. Is there a good amount of time to spend on a bike machine? Or another way for counting calories?

 

[Danimal]

you keep burning after you ride - id say about 1100

http://www.hulu.com/watch/28329/dr-horribles-sing-along-blog-act-two#s-p1-st-i1