Ahummingbird needs 10 grams of sugar and 8 grams of protein each day. one honeysuckle flower provides 20 mg of sugar and 10 mg of protein. one nasturtium flower provides 10 mg of sugar and 10 mg of protein. it takes 5 seconds to feed from a nasturtium and 20 seconds per honeysuckle. how many minutes does it take to get exactly the food it needs?

The hummingbird's nutritional needs daily are 10,000 mg of sugar and 8,000 mg of protein.

Since one nasturtium flower provides 10 mg of sugar and 10 mg of protein, the hummingbird needs 1000 nasturtium flowers each day for its nutritional needs (10,000/10 = 1000).
Since one honeysuckle flower provides 20 mg of sugar and 10 mg of protein, the hummingbird needs 500 honeysuckle flowers each day for its nutritional needs. 
If the hummingbird feeds only on nasturtium flowers, then the bird will need 5,000 seconds to get exactly the food it needs. This is calculated based on the information that it takes 5 seconds to feed on a nasturtium: 1000 flowers daily * 5 seconds = 5000 sec = 83,3 min. 
If the hummingbird feeds only on honeysuckle flowers, then the bird will need: 500 flowers * 20 seconds = 10,000 sec = 166,6 min.

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Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.