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Most hummingbirds flap their wings about 50 or so times a second (3,000 per minute). This means all we can see is a blur. A Hummingbird flaps it's wings 50 to 200 times per second.
Incubation lasts about 14-16 days--perhaps as long as 21 days in cool weather--during which time the female Ruby-throated Hummingbird is on the nest for about 50-55 minutes out of each hour. When the chicks hatch, they are about 2cm long, altricial (naked), and with very short bills.