determinging dhcp lease period

Val asked:

As I understand, it is responsibility of the client to send renew requests periodically. How long is this period? Can I receive this information once IP address is dynamically assigned do my interface? Does DHCP protocol provides me this information or I should ask it from the server administrator?

My answer:

The validity period of the lease is however long you set it up to be on the DHCP server. Clients typically renew the lease once 50% of that time has elapsed, though actual DHCP client implementations may vary.

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