Constant lightning_invoice::DEFAULT_MIN_FINAL_CLTV_EXPIRY

pub const DEFAULT_MIN_FINAL_CLTV_EXPIRY: u64 = 18;

Default minimum final CLTV expiry as defined by BOLT 11.

Note that this is not the same value as rust-lightning’s minimum CLTV expiry, which is provided in MIN_FINAL_CLTV_EXPIRY.