Environment variable that specifies how long (in seconds) LND will keep
trying to route an outgoing payment before giving up. Passed as
timeout_seconds in LND SendPaymentRequest. Must parse as an i32 in the
range [1, 600].
Environment variable that specifies the time_pref used in LND
SendPaymentRequest. Must parse as an f64 in the range [-1.0, 1.0], where
-1 optimizes for fees and 1 optimizes for reliability.