diff --git a/core/src/main/java/org/bitcoinj/crypto/KeyCrypterScrypt.java b/core/src/main/java/org/bitcoinj/crypto/KeyCrypterScrypt.java
index 8d533d11..2b201f00 100644
--- a/core/src/main/java/org/bitcoinj/crypto/KeyCrypterScrypt.java
+++ b/core/src/main/java/org/bitcoinj/crypto/KeyCrypterScrypt.java
@@ -18,6 +18,7 @@
 package org.bitcoinj.crypto;
 
 import com.google.common.base.Objects;
+import com.google.common.base.Stopwatch;
 import com.google.protobuf.ByteString;
 import com.lambdaworks.crypto.SCrypt;
 import org.bitcoinj.core.Utils;
@@ -154,7 +155,10 @@ public class KeyCrypterScrypt implements KeyCrypter {
                 log.warn("You are using a ScryptParameters with no salt. Your encryption may be vulnerable to a dictionary attack.");
             }
 
+            final Stopwatch watch = Stopwatch.createStarted();
             byte[] keyBytes = SCrypt.scrypt(passwordBytes, salt, (int) scryptParameters.getN(), scryptParameters.getR(), scryptParameters.getP(), KEY_LENGTH);
+            watch.stop();
+            log.info("Deriving key took {} for {} scrypt iterations.", watch, scryptParameters.getN());
             return new KeyParameter(keyBytes);
         } catch (Exception e) {
             throw new KeyCrypterException("Could not generate key from password and salt.", e);