diff --git a/bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxConstants.java b/bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxConstants.java
index 5a54e7f44..02c7b8a5e 100644
--- a/bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxConstants.java
+++ b/bramble-api/src/main/java/org/briarproject/bramble/api/mailbox/MailboxConstants.java
@@ -5,6 +5,7 @@ import org.briarproject.bramble.api.plugin.TransportId;
 import java.util.List;
 
 import static java.util.Collections.singletonList;
+import static java.util.concurrent.TimeUnit.DAYS;
 import static java.util.concurrent.TimeUnit.HOURS;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_FRAME_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_PAYLOAD_LENGTH;
@@ -65,4 +66,8 @@ public interface MailboxConstants {
 	 */
 	long PROBLEM_MS_SINCE_LAST_SUCCESS = HOURS.toMillis(1);
 
+	/**
+	 * The maximum latency of the mailbox transport in milliseconds.
+	 */
+	long MAX_LATENCY = DAYS.toMillis(14);
 }
diff --git a/bramble-core/src/main/java/org/briarproject/bramble/plugin/file/MailboxPluginFactory.java b/bramble-core/src/main/java/org/briarproject/bramble/plugin/file/MailboxPluginFactory.java
index 98bf72441..351368c84 100644
--- a/bramble-core/src/main/java/org/briarproject/bramble/plugin/file/MailboxPluginFactory.java
+++ b/bramble-core/src/main/java/org/briarproject/bramble/plugin/file/MailboxPluginFactory.java
@@ -9,14 +9,12 @@ import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
-import static java.util.concurrent.TimeUnit.DAYS;
 import static org.briarproject.bramble.api.mailbox.MailboxConstants.ID;
+import static org.briarproject.bramble.api.mailbox.MailboxConstants.MAX_LATENCY;
 
 @NotNullByDefault
 public class MailboxPluginFactory implements SimplexPluginFactory {
 
-	private static final long MAX_LATENCY = DAYS.toMillis(14);
-
 	@Inject
 	MailboxPluginFactory() {
 	}