I can provide some general information about narcissistic behavior and devaluation in relationships.
Narcissists, both overt and covert, often follow similar patterns in their relationships. The devaluation stage is a common phase in the cycle of narcissistic abuse. During this stage, the narcissist starts to devalue and belittle their partner, making them feel unworthy, inadequate, and emotionally drained. This behavior can happen over an extended period or, in some cases, occur more rapidly.
The length of time the devaluation stage lasts can vary depending on the individual and the dynamics of the relationship. It could occur for weeks, months, or even longer before the final discard. During this period, the victim's self-esteem may be significantly eroded, and they might find themselves walking on eggshells and trying to please the narcissist in vain.
The discard phase is when the narcissist decides to end the relationship, often abruptly and without warning. This can leave the victim in a state of shock and confusion, as they may not have anticipated the sudden termination after experiencing the devaluation.
Remember that every person's experience is unique, and not all relationships with narcissists follow the same timeline. If you or someone you know is dealing with a potentially abusive relationship, it's essential to seek support from friends, family, or professionals who can help navigate the situation safely.