AssetBundle 在被自动删除前可在缓存中保持未使用状态的秒数。
该值默认为 150 天（12,960,000 秒）。 较小的值将导致更积极地清理缓存，以最大限度减少磁盘存储空间的使用量。延时不能设置为多于 12,960,000 秒。
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