The most relevant (practical) questions to me are, how does this capacitor behave long-term? How does it fare over a large number of charge/discharge cycles? I'

The most relevant (practical) questions to me are, how does this capacitor behave long-term? How does it fare over a large number of charge/discharge cycles? I'd like to assume that, since it's not a battery, thus not based on chemical process for energy storage, it will retain its initial performance for a long time, but the question is - how long? A human generation (i.e. 25-30 years)? Or maybe longer, as for at least ten generations? That would directly affect the demand for long term investments in the construction sector. And if things may sound rosy from its storage capacity capability, if it will get used for combined structural and energy storage use, what long term impact on structural properties may render this dual use?