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How long do serotonin receptors take to heal? 

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Although the acute effect of selective serotonin reuptake inhibitors in elevating synaptic serotonin concentrations is well known, the clinical amelioration of depressive symptoms requires 14-21 days of treatment, suggesting that numerous other rearrangements of function in the CNS must take place.
After seven days the GABA/serotonin amacrine cells cannot take up exogenous serotonin suggesting that all of these neurons are irreversibly damaged.
These results indicate that a high-dose MDMA regimen results in long-lasting depletions of serotonin.
These data indicate that long-term therapy has different effects on serotonin transmission from short-term (1- to 2-month) therapy.
The results indicate that, after long-term blockade or stimulation, serotonin autoreceptors become respectively hyper- or hyposensitive towards serotonin.
We also observed receptors that did not possess counterpart 5‐HT staining, suggesting that these may also mediate long‐term neurohormonal functions of serotonin.
Our study suggests that 5-HT2A receptors internalize and return to the surface after both serotonin- and PKC-mediated processes.
We conclude that serotonin 5-HT2 receptors both induce and undergo several forms of desensitization.
Pharmacological manipulations and receptor knockdown indicate that serotonin acts at least in part via 5-HT1A receptors.
These data support previous suggestions that supersensitivity develops specifically in serotonin receptors following afferent denervation.

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