Constant standalone_node::service::GRANDPA_JUSTIFICATION_PERIOD

const GRANDPA_JUSTIFICATION_PERIOD: u32 = 512;

The minimum period of blocks on which justifications will be imported and generated. Value is copied from the solo chain template: https://github.com/paritytech/polkadot-sdk/blob/2352982717edc8976b55525274b1f9c9aa01aadd/templates/solochain/node/src/service.rs#L24