If the tincture is being swallowed then a empty stomach can increase the physiological response. This is due to the stomach passing the contents off to the duodenum quicker. Stomach with food solids can take hours to empty. This was one of the first tricks for improving my pain medications. So i would as a result, take my medication in the morning followed by my other tricks. The duration between doses also plays a role, because of absorption, distribution, metabolism, and excretion. This changes based on the rate and strength of each dose. But also because of simple tolerance. Even over a short duration, tolerance can have an effect. It is one contributing factor of hangovers. So relieving yourself for longer periods such as overnight, can give you a much stronger effect the next time.