Constant libp2p_rendezvous::DEFAULT_TTL

source ยท 
pub const DEFAULT_TTL: Ttl = _; // 7_200u64
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If unspecified, rendezvous nodes should assume a TTL of 2h.

See https://github.com/libp2p/specs/blob/d21418638d5f09f2a4e5a1ceca17058df134a300/rendezvous/README.md#L116-L117.