diff --git a/lib/constants.js b/lib/constants.js
index abacd0d..51c62d3 100644
--- a/lib/constants.js
+++ b/lib/constants.js
@@ -1,3 +1,3 @@
 export const SPARK_VERSION = '1.7.1'
 export const MAX_CAR_SIZE = 200 * 1024 * 1024 // 200 MB
-export const APPROX_ROUND_LENGTH_IN_MS = 60 * 60_000 // 1 hour
+export const APPROX_ROUND_LENGTH_IN_MS = 20 * 60_000 // 20 minutes