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It would be nice to have a table of how many hours per day does a moderate hobbyist do for each of the activities. For biking, I can imagine 4-6 hours being moderate, and for skydiving it would be just 10 minutes. That way, we can do the above math ourselves.

Also, for some activities, how you measure time is really important. Skydiving is such a short duration activity that it really matters if you are measuring a) free fall time b) parachute time c) between plane and ground time d) between takeoff and landing zone time e) time spent at skydiving area.

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