Constant WAN_SIG_MAX_AGE_SECS 

pub const WAN_SIG_MAX_AGE_SECS: i64 = _; // 2_100i64

How old a carried wan_ts_secs may be: the relay’s own 1800 s delivery TTL plus 300 s of slack (§2.4). A shorter window would reject messages the relay is still legitimately holding.