Being new here, I'm not always confident that I have something useful to share. But I read your post and thought, "Hey, I can do some research and maybe be helpful here."
So I google the topic and spend about a half an hour sifting through all these different sites with calorie-burning calculators and charts, some of which take into consideration one's present weight, some that don't.
And I came to this conclusion: Everyone estimates it differently!
Most of the sites, though, put 90 minutes of leisure biking at somewhere between 700-900 calories burned.
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