diff --git a/enhancer/cli/train_config/dataset/DNS-2020.yaml b/enhancer/cli/train_config/dataset/DNS-2020.yaml
index f23d412..d498be5 100644
--- a/enhancer/cli/train_config/dataset/DNS-2020.yaml
+++ b/enhancer/cli/train_config/dataset/DNS-2020.yaml
@@ -4,7 +4,7 @@ name : dns-2020
 duration : 5.0
 sampling_rate: 16000
 batch_size: 64
-valid_size: 0.025
+valid_minutes: 30.0
 files:
   train_clean : CleanSpeech_training
   test_clean : CleanSpeech_testing