The timing for a narcissistic ex to unblock you, if they choose to do so at all, can depend on various factors, such as the nature of your past relationship, the reason for the block, the level of maturity of the individual, and their emotional state.
Narcissists may block or distance themselves for various reasons, including to exert control, manipulate emotions, or avoid confrontation. Sometimes, they may unblock you as a way to reestablish contact when they feel it suits their needs or when they believe they can regain control. In other cases, they may never unblock you if they don't see any benefit in doing so.
It's essential to focus on your well-being and personal growth rather than waiting for someone else's actions. If the relationship was unhealthy or abusive, it might be better to move on and prioritize your own healing and happiness.
Remember, every individual and situation is unique, so it's difficult to provide a definite answer about how long it might take for a narcissistic ex to unblock you. Instead, consider seeking support from friends, family, or professionals who can help you navigate through the emotions and challenges that come with dealing with a narcissistic ex.