Constant DEFAULT_CONTROL_TIMEOUT_SECS 

pub const DEFAULT_CONTROL_TIMEOUT_SECS: u64 = 30;

How long a control request waits for the daemon before giving up, when LEVIATH_CONTROL_TIMEOUT_SECS is unset.

Generous enough to cover a busy daemon’s control loop, short enough that a wedged one is reported rather than waited on indefinitely.