Centralize decentralized timing constants

sdk/src/timing.rs

@@ -2,6 +2,13 @@
 use std::time::Duration;
 use std::time::{SystemTime, UNIX_EPOCH};
 
+pub const NUM_TICKS_PER_SECOND: usize = 10;
+
+// At 10 ticks/s, 8 ticks per slot implies that leader rotation and voting will happen
+// every 800 ms. A fast voting cadence ensures faster finality and convergence
+pub const DEFAULT_TICKS_PER_SLOT: u64 = 8;
+pub const DEFAULT_SLOTS_PER_EPOCH: u64 = 64;
+
 pub fn duration_as_us(d: &Duration) -> u64 {
     (d.as_secs() * 1000 * 1000) + (u64::from(d.subsec_nanos()) / 1_000)
 }