NS レコードをキャッシュしてもよい期間とは?

$ dig -t ns fla.jp @a.dns.jp +dnssec

fla.jp.                 86400   IN      NS      ns-cloud-d2.googledomains.com.

$ dig -t ds fla.jp @a.dns.jp +dnssec

fla.jp.                 7200    IN      DS      57175 8 2 D5743A011A1D4D0DDC2F54B1810AF6D3A1F50DC7C1B8C219A2B6C3F8 02E297AE
fla.jp.                 7200    IN      RRSIG   DS 8 2 7200 20230724174502 20230624174502 23526 jp. y/kYH6g/D3mQQxFBF+qqgXSzuolJNCpkcEhjjZOZ/Bi5aJ2B8ZStu6vd 2SGk2mqZ2ZaWZMEcoLMYhjXLrAI0qQWQ9XkzksnXTKmySwqzZ+aZCVl3 TKLwkAjCIsM5EA+vA8AP7jQO2CIJ1hAgAWjj9PEzUHbIs3bymRhwbVje gf4=

$ dig -t dnskey fla.jp +dnssec @ns-cloud-d2.googledomains.com.

fla.jp.                 300     IN      DNSKEY  257 3 8 AwEAAYCpnFDtSf7ShQ2EmL4Cqn01+ScrlgVV4aC/a4SQmh9FDBjyxFFs PqSHyDaiPb04vCfdVfCVr0e/+hangAXBd7Zdt4iVrEUDON+rigdgFmSo J3nBTOm/v8mBgAf1whw4ti4X/1fXAptw/nIotzGRwpfWbG/NuFJEJqu1 kNELbTWoAJKfAozxKnRRleYW6zNWZ7JZPdUj3f/dDneOjjDT6d6JRNKA f/ar6APpgmG+vktGm1HA8oyo66+uL2+M1n5FjPjQNSU75rc4AiekSSMQ VDCaSJHQsCjfW4mwrTK2P9WnGVuIxxvsO3SBXZ4aVVxSQqlA4hK2rZqJ 4gnPyWvkiSE=
fla.jp.                 300     IN      DNSKEY  256 3 8 AwEAAYpbgWZLJbJ/aHisZTu+vvO83EfytihWy3DBzhWP8Y4AdoIhh187 +vVa1G1QKkiqeqbjBWA6LX6e2Gefd8Il+UCL/rylYWGB+qcCCfQ4IeMS e6Pn5zEAatLXPNfYvmvWFQDlqxykEaMXxCMhJvcVmCoLPHl3+h5GeTCI 4OxnT0td
fla.jp.                 300     IN      RRSIG   DNSKEY 8 2 300 20230714142859 20230622142859 57175 fla.jp. I76Ejq2rI6bjvbF40+nFWVCXPhz7+tnEVNYYSL55OEqDwoj+jk2OYXWF Wi7g73HdXLx76yCrvKeKvqiHxArIO7UuyrHFtXhopLd70Zsa/Jeofjb0 YcoRjTceXJ3vDh66PuskiUe6E2XyGFfavNTP/JhnJsmFYdQ7qJYlRZ/7 2EtRLqStwo9etD5lQyjjiHwnK2oefRnfkPUcoIoa35V7E1RSnpOZK4Ek 90zFjrQP3udETa+NCFdDQ3SS1ayMNxcK0kwuaAmX6Fu30+iUL5dHx48T rMIFmBWPwXpvuoIlxedfA4iydjf1mfolC/cnzPk4aDwGFST3T9RinYag lwYLrQ==

fla.jp.                 21600   IN      NS      ns-cloud-d4.googledomains.com.

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