diff --git a/lambda/fulfillment/lib/middleware/2_preprocess.js b/lambda/fulfillment/lib/middleware/2_preprocess.js
index d4b53b4c..86cfb771 100644
--- a/lambda/fulfillment/lib/middleware/2_preprocess.js
+++ b/lambda/fulfillment/lib/middleware/2_preprocess.js
@@ -73,12 +73,18 @@ async function get_userInfo(userId, idattrs, userPrefs = undefined) {
     return req_userInfo;
 }
 
-async function update_userInfo(userId, req_userInfo) {
+async function update_userInfo(userId, req_userInfo, ttlDays) {
     const res_userInfo = _.cloneDeep(req_userInfo);
     const dt = new Date();
     res_userInfo.FirstSeen = req_userInfo.FirstSeen || dt.toString();
     res_userInfo.LastSeen = dt.toString();
     res_userInfo.InteractionCount = req_userInfo.InteractionCount + 1;
+    // set userInfo record TTL
+    if (ttlDays > 0) {
+        const secondsPerDay = 24 * 60 * 60;
+        const ttlDate = new Date(dt.getTime() + ttlDays * secondsPerDay * 1000);
+        res_userInfo.ttl = Math.floor(ttlDate.getTime() / 1000);
+    }
     return res_userInfo;
 }
 
@@ -211,11 +217,11 @@ module.exports = async function preprocess(req, res) {
     _.set(req, '_userInfo', req_userInfo);
     // set the userPrefs session attribute to the value returned from DDB
     _.set(req, 'session.userPrefs', _.get(req_userInfo, 'userPrefs', {}));
-
     // Add _userInfo to res, with updated timestamps
     // May be further modified by lambda hooks
     // Will be saved back to DynamoDB in userInfo.js
-    const res_userInfo = await update_userInfo(userId, req_userInfo);
+    const ttlDays = _.get(req, '_settings.USERINFO_TTL_DAYS', 0)
+    const res_userInfo = await update_userInfo(userId, req_userInfo, ttlDays);
     _.set(res, '_userInfo', res_userInfo);
 
     if (_.get(req, '_settings.REMOVE_ID_TOKENS_FROM_SESSION', false)) {
diff --git a/templates/master/default-settings.js b/templates/master/default-settings.js
index b1947f92..5d76ce00 100644
--- a/templates/master/default-settings.js
+++ b/templates/master/default-settings.js
@@ -109,6 +109,7 @@ const default_settings = {
     LLM_QA_NO_HITS_REGEX:
         'Sorry,  //remove comment to enable custom no match (no_hits) when LLM does not know the answer.',
     LLM_PROMPT_MAX_TOKEN_LIMIT: '${LLM_PROMPT_MAX_TOKEN_LIMIT}',
+    USERINFO_TTL_DAYS: 0, // Set to 0 to disable setting a ttl property in DyanmoDB
 };
 
 const defaultGenerateQueryPromptTemplate =
diff --git a/templates/master/dynamodb/index.js b/templates/master/dynamodb/index.js
index 6067fdee..9dd2be7a 100644
--- a/templates/master/dynamodb/index.js
+++ b/templates/master/dynamodb/index.js
@@ -33,6 +33,10 @@ module.exports = {
                     KeyType: 'HASH',
                 },
             ],
+            TimeToLiveSpecification: {
+                AttributeName: "ttl",
+                Enabled: true
+            },
         },
         Metadata: util.cfnNag(['W74']),
     },