diff --git a/CHANGES.txt b/CHANGES.txt
index 675236e..5ea5f85 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -5,6 +5,7 @@
   Stop cleaner when plugin stops
   Move to the ClientApp interface, remove all static refs
   Attempt to fix crash after update
+  Add zzzot.config file to set interval
 
 0.11.0
   2014-11-11
diff --git a/build.xml b/build.xml
index daaa8af..7171c12 100644
--- a/build.xml
+++ b/build.xml
@@ -50,6 +50,7 @@
         <!-- make the install xpi2p -->
         <copy file="scripts/i2ptunnel.config" todir="plugin/" overwrite="true" />
         <copy file="scripts/plugin.config" todir="plugin/" overwrite="true" />
+        <copy file="scripts/zzzot.config" todir="plugin/" overwrite="true" />
         <exec executable="echo" osfamily="unix" failonerror="true" output="plugin/plugin.config" append="true">
             <arg value="version=${release.number}-b${build.number}" />
         </exec>
diff --git a/scripts/zzzot.config b/scripts/zzzot.config
new file mode 100644
index 0000000..af8e7a4
--- /dev/null
+++ b/scripts/zzzot.config
@@ -0,0 +1,3 @@
+# announce interval in seconds
+# minimum 900 (15 minutes), maximum 21600 (6 hours)
+interval=1620
diff --git a/src/java/net/i2p/zzzot/Torrents.java b/src/java/net/i2p/zzzot/Torrents.java
index e45b903..99d1056 100644
--- a/src/java/net/i2p/zzzot/Torrents.java
+++ b/src/java/net/i2p/zzzot/Torrents.java
@@ -32,12 +32,16 @@ public class Torrents extends ConcurrentHashMap<InfoHash, Peers> {
     private static final int CACHE_SIZE = 2048;
     private final SDSCache<InfoHash> _hashCache;
     private final SDSCache<PID> _pidCache;
+    private final Integer _interval;
 
-
-    public Torrents() {
+    /**
+     *  @param interval in seconds
+     */
+    public Torrents(int interval) {
         super();
         _hashCache = new SDSCache<InfoHash>(InfoHash.class, InfoHash.LENGTH, CACHE_SIZE);
         _pidCache = new SDSCache<PID>(PID.class, PID.LENGTH, CACHE_SIZE);
+        _interval = Integer.valueOf(interval);
     }
 
     public int countPeers() {
@@ -48,6 +52,14 @@ public class Torrents extends ConcurrentHashMap<InfoHash, Peers> {
         return rv;
     }
 
+    /**
+     *  @return in seconds
+     *  @since 0.12.0
+     */
+    public Integer getInterval() {
+        return _interval;
+    }
+
     /**
      * Pull from cache or return new
      *
diff --git a/src/java/net/i2p/zzzot/ZzzOT.java b/src/java/net/i2p/zzzot/ZzzOT.java
index 98267df..aeb58c1 100644
--- a/src/java/net/i2p/zzzot/ZzzOT.java
+++ b/src/java/net/i2p/zzzot/ZzzOT.java
@@ -17,6 +17,7 @@ package net.i2p.zzzot;
  */
 
 import java.util.Iterator;
+import java.util.Properties;
 
 import net.i2p.I2PAppContext;
 import net.i2p.util.SimpleTimer2;
@@ -28,12 +29,28 @@ class ZzzOT {
 
     private final Torrents _torrents;
     private final Cleaner _cleaner;
+    private final long EXPIRE_TIME;
 
+    private static final String PROP_INTERVAL = "interval";
     private static final long CLEAN_TIME = 4*60*1000;
-    private static final long EXPIRE_TIME = 60*60*1000;
+    private static final int DEFAULT_INTERVAL = 27*60;
+    private static final int MIN_INTERVAL = 15*60;
+    private static final int MAX_INTERVAL = 6*60*60;
 
-    ZzzOT(I2PAppContext ctx) {
-        _torrents = new Torrents();
+    ZzzOT(I2PAppContext ctx, Properties p) {
+        String intv = p.getProperty(PROP_INTERVAL);
+        int interval = DEFAULT_INTERVAL;
+        if (intv != null) {
+            try {
+                interval = Integer.parseInt(intv);
+                if (interval < MIN_INTERVAL)
+                    interval = MIN_INTERVAL;
+                else if (interval > MAX_INTERVAL)
+                    interval = MAX_INTERVAL;
+            } catch (NumberFormatException nfe) {}
+        }
+        _torrents = new Torrents(interval);
+        EXPIRE_TIME = 1000 * (interval + interval / 2);
         _cleaner  = new Cleaner(ctx);
     }
 
diff --git a/src/java/net/i2p/zzzot/ZzzOTController.java b/src/java/net/i2p/zzzot/ZzzOTController.java
index c595ac9..0c1c1d4 100644
--- a/src/java/net/i2p/zzzot/ZzzOTController.java
+++ b/src/java/net/i2p/zzzot/ZzzOTController.java
@@ -68,6 +68,7 @@ public class ZzzOTController implements ClientApp {
     private ClientAppState _state = UNINITIALIZED;
 
     private static final String NAME = "ZzzOT";
+    private static final String CONFIG_FILE = "zzzot.config";
     private static final String BACKUP_SUFFIX = ".jetty6";
     private static final String[] xmlFiles = {
         "jetty.xml", "contexts/base-context.xml", "contexts/cgi-context.xml",
@@ -81,7 +82,16 @@ public class ZzzOTController implements ClientApp {
         _log = ctx.logManager().getLog(ZzzOTController.class);
         _mgr = mgr;
         _args = args;
-        _zzzot = new ZzzOT(ctx);
+        File cfile = new File(_context.getAppDir(), "plugins/zzzot/" + CONFIG_FILE);
+        Properties props = new Properties();
+        if (cfile.exists()) {
+            try {
+                DataHelper.loadProps(props, cfile);
+            } catch (IOException ioe) {
+                _log.error("Failed loading zzzot config from " + cfile, ioe);
+            }
+        }
+        _zzzot = new ZzzOT(ctx, props);
         _state = INITIALIZED;
     }
 
diff --git a/src/jsp/announce.jsp b/src/jsp/announce.jsp
index 24a75a6..cdfbdec 100644
--- a/src/jsp/announce.jsp
+++ b/src/jsp/announce.jsp
@@ -27,7 +27,6 @@
  */
 	// would be nice to make these configurable
 	final int MAX_RESPONSES = 25;
-	final int INTERVAL = 27*60;
 	final boolean ALLOW_IP_MISMATCH = false;
 	final boolean ALLOW_COMPACT_RESPONSE = true;
 
@@ -185,7 +184,7 @@
 		Peers peers = torrents.get(ih);
 		if (matchIP && peers != null)
 			peers.remove(pid);
-		m.put("interval", Integer.valueOf(INTERVAL));
+		m.put("interval", torrents.getInterval());
 	} else {
 		Peers peers = torrents.get(ih);
 		if (peers == null) {
@@ -210,7 +209,7 @@
 		if (matchIP)
 			p.setLeft(left);
 
-		m.put("interval", Integer.valueOf(INTERVAL));
+		m.put("interval", torrents.getInterval());
 		int size = peers.size();
 		int seeds = peers.countSeeds();
 		m.put("complete", Integer.valueOf(seeds));