Does it take four bee loads of nectar to make one drop of honey?

Although a bee's honey crop can hold up to 100 milligrams (mg) of nectar, they usually return to the hive with about 40 mg, so four loads would be about 160 mg. However, it doesn't end there. Nectar is between 80 and 90 per cent water. As the bees convert the nectar to honey, most of this water is evaporated off until the honey is down to about 16 per cent water so from the original 160 mg, over 100 mg of water is removed.
The four bee loads of nectar is now down to around 50 milligrams. The relative density of honey is about 1.4, so a 5ml teaspoon will hold around 7 grams of honey, which is 140 lots of 50 mg. I'll leave it to you to work out whether you can get 140 drops of honey into a teaspoon.