diff --git a/state_machines/timer.py b/state_machines/timer.py
new file mode 100644
index 0000000..09f6b68
--- /dev/null
+++ b/state_machines/timer.py
@@ -0,0 +1,33 @@
+"""
+Copyright 2020 The Magma Authors.
+
+This source code is licensed under the BSD-style license found in the
+LICENSE file in the root directory of this source tree.
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+from datetime import datetime, timedelta
+
+
+class StateMachineTimer():
+    def __init__(self, seconds_remaining: int) -> None:
+        self.start_time = datetime.now()
+        self.seconds = seconds_remaining
+
+    def is_done(self) -> bool:
+        time_elapsed = datetime.now() - self.start_time
+        if time_elapsed > timedelta(seconds=self.seconds):
+            return True
+        return False
+
+    def seconds_elapsed(self) -> int:
+        time_elapsed = datetime.now() - self.start_time
+        return int(time_elapsed.total_seconds())
+
+    def seconds_remaining(self) -> int:
+        return max(0, self.seconds - self.seconds_elapsed())