No, Buddhist prayer flags are generally *not* taken down once the prayer or wish is believed to be "answered." In fact, that's not really the intention behind them.
Here's why:
* The Wind Carries the Prayers: The primary purpose of prayer flags is not to directly petition a deity or guarantee a specific outcome. Instead, the prayers and mantras printed on them are meant to be carried by the wind and spread throughout the surrounding environment. The act of the wind gently releasing these blessings is itself considered a positive force.
* Continuous Cycle: The cycle of putting up new flags and letting old ones fade and disintegrate is a natural part of the process. It symbolizes the impermanence of life and the constant renewal of positive energy. As the old flags fade, their prayers are believed to continue spreading and new flags are raised to continue the flow.
* Respectful Disposal (or Lack Thereof): Taking down flags after an "answer" would be seen as arrogant, implying that one's wish has been fulfilled and the flags are no longer needed. It's considered more respectful to let them naturally decay and return to the elements. However, if a flag is damaged or needs to be taken down for practical reasons (like repairs), it's often burned respectfully, allowing the smoke to carry the prayers upwards.
In summary, prayer flags are a continuous offering and a way to spread blessings and positive energy. They are left to the elements to naturally decompose, and are not taken down after a prayer is believed to be "answered".