There is no good way. Clothes fabrics are diverse, and skin is protein and oil. The different pheros will partition into these different mediums at different rates and at differing levels of tenacity. Also, temperature and just airflow will effect the duration. I would suggest trying to find the partial pressures of the different pheros. This will tell you, more or less, their relative rates of loss. Not how long do they stay on you, but if you had equal amounts of a and b, which will float away faster. Unfortunately, the whole model is much to complex to get time values. I guess that means that these have to empirical experiments. . .
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