codex 的 Astra 这些模型缓存时间？

prompt_cache_options.ttl to control the minimum cache lifetime. The only supported value, 30m, is also the default. A cached prefix remains eligible for reuse for 30 minutes after its most recent write or reuse, though OpenAI may retain it longer

API 是 30min，超过 30min 尽力保存，codex 应该差不多。

5.4/5.5时期，有过2小时依然生效的缓存记录，仅为个例。