In an artificial setting, Farina and Nuñez (1991) recorded durations of trophallactic exchanges that ranged from roughly 5-13 sec. In an observation hive, Farina and Wainselboim (2001) recorded trophallactic exchanges between foragers and receiver bees lasting roughly 23-26 sec. 

Both the size of the nectar load a forager takes and the rate at which she unloads it to a receiver bee respond positively to the reward level of the nectar and proportionally to each other; so, unloading time is held fairly constant with respect to reward level (Farina and Wainselboim 2001).

Doug

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Farina, W. M., & Núñez, J. A. (1991). Trophallaxis in the honeybee, Apis mellifera (L.) as related to the profitability of food sources. Animal Behaviour.

Farina, W. M., & Wainselboim, A. J. (2001). Changes in the thoracic temperature of honeybees while receiving nectar from foragers collecting at different reward rates. Journal of Experimental Biology.
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