Constant solana_sdk::epoch_schedule::MAX_LEADER_SCHEDULE_EPOCH_OFFSET

pub const MAX_LEADER_SCHEDULE_EPOCH_OFFSET: u64 = 3; // 0x0000_0000_0000_0003u64

The maximum number of slots before an epoch starts to calculate the leader schedule. Default is an entire epoch, i.e. leader schedule for epoch X is calculated at the beginning of epoch X - 1.