diff --git a/src/packages/engine-ts/src/configs/simulation.ts b/src/packages/engine-ts/src/configs/simulation.ts
index eb280a37..b5fadc98 100644
--- a/src/packages/engine-ts/src/configs/simulation.ts
+++ b/src/packages/engine-ts/src/configs/simulation.ts
@@ -15,3 +15,6 @@ export const WORLD_SEED = 42
 
 /** Default playback buffer duration in seconds (used when ?buffer= is absent). */
 export const DEFAULT_BUFFER_SECONDS = 10
+
+/** Years per simulation tick during scenario phase. */
+export const DEFAULT_DT = 10