How many hours or minutes do i need to bike to lose 3500 calories or a pound?

Ive benn bike riding everyday recently how many hours or minutes does it take to lose a pound I have time and also any stomach excersises you can tell me about and thigh excerisies i want to lose 30pounds before august 27th the start of school

Dont make fun of me I need support but im

11 years old and 160 pounds ALSO ANY EXCERSISES FOR GOING UP AND DOWN STAIR IF I CAN LOSE A POUND BY DOING ANY EXCERSISES LIIKE RUNNING UP THE STAIRS


THANKS AHEAD A TIME XOXOXOXOX
NO MEDICAL STUFF OR ACAI PILLS MY PARENTS WONT BUY IT
 
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