Essential oils are natural and unpredictable - they shift and morph once they are blended together.
The longevity or your scent will vary based on your blend. For example the lighter molecules in citrus eo's typically dry off more quickly, where as heady florals or rich resins are more tenacious, resulting in a longer sillage. Other things that can affect your fragrances lasting power is the humidity where you live and where you apply your fragrance will all affect longevity.
We recommend applying your fragrance right after you shower while your skin is still damp. Use an unscented or custom scented body butter or lotion at the nape and back of the neck, in the crook of your elbow or lightly spritzed on a scarf or collar.