It depends almost entirely on one variable: whether the uncertainty gets resolved.
Tennov's research suggested the typical range for unresolved limerence is 18 months to 3 years. Other researchers have documented cases lasting much longer, a decade or more, when intermittent contact keeps the loop running. I know someone who maintained a limerent fixation for seven years on a person they saw twice a year at a work conference. Every time they thought it was fading, there'd be one slightly warmer conversation, and everything would restart.
That's the mechanism: intermittent reinforcement. The same psychological principle that makes slot machines so effective. This is really the meaning of limerence in action: a loop that keeps running as long as uncertainty feeds it.
Neuroscience supports this mechanism directly. A landmark 2005 fMRI study by Helen Fisher, Arthur Aron, and Lucy Brown (published in the Journal of Comparative Neurology) scanned the brains of 17 participants aged 18–26 who described themselves as intensely in love. When shown photos of their limerent object, the brain's dopamine reward centers, specifically the ventral tegmental area and caudate nucleus, activated with the same intensity as seen in cocaine cravings. Separately, a 1999 study by Donatella Marazziti at the University of Pisa found that people in the early stages of romantic love had serotonin transporter levels approximately 40% lower than controls, statistically indistinguishable from patients with severe OCD.
Fisher et al., Journal of Comparative Neurology, 2005; Marazziti et al., Psychological Medicine, 1999
Your brain isn't responding to the warmth; it's responding to the unpredictability. A clear and consistent "no" would, paradoxically, end the limerence faster than ambiguous occasional warmth. Because the "no" removes what the feeling is feeding on.
How long does limerence last under different conditions:
- With maintained ambiguous contact: potentially years. The loop has inputs. It keeps running.
- With clear rejection, no contact: research suggests the acute phase typically breaks within 6–18 months, though the grief of that ending is its own process. That grieving process has its own rhythm - if you're navigating the emotional aftermath, understanding the stages of grief after a breakup can help you make sense of what you're moving through.
- With reciprocation and a real relationship forming: the obsessive intensity usually fades over weeks to months as certainty replaces uncertainty. What remains, if it’s a good relationship, is something steadier, and simple habits like the 2-2-2 rule in relationships can help keep that connection strong. That steadiness is what separates limerence from genuine love - and it's also what makes knowing how to be a good boyfriend matter so much once limerence gives way to a real relationship. If limerence is fading into an actual relationship, some grounded dating advice can help you navigate that shift with more clarity.
- With deliberate no contact and attention redirection: faster than maintained contact and slower than you'd like, but achievable. Most people report the intrusive thoughts becoming less frequent within a few months.
