diff --git a/custom_components/history_services/common.py b/custom_components/history_services/common.py
index 659c8ce..d5405e9 100644
--- a/custom_components/history_services/common.py
+++ b/custom_components/history_services/common.py
@@ -3,7 +3,7 @@
 import logging
 
 from pathlib import Path
-from datetime import datetime as dt
+from datetime import datetime as dt, timedelta as td
 
 from homeassistant.core import HomeAssistant, ServiceCall, ServiceResponse, SupportsResponse, callback, valid_entity_id
 from homeassistant.components.recorder import history
@@ -20,19 +20,21 @@ def open_file(filepath, mode, x):
         return x(file)
 
 def get_significant_states(hass: HomeAssistant, call: ServiceCall):
-    now = dt_util.utcnow()
-    start_time = now - ONE_DAY
-    end_time = now
-
     entity_id = call.data["entity_id"]
     entity_ids = list([entity_id])
 
-    if "start" in call.data:
-        start_time = dt_util.as_utc(call.data["start"])
+    last_hours = call.data["last_hours"]
 
+    now = dt_util.utcnow()
+
+    end_time = now
     if "end" in call.data:
         end_time = dt_util.as_utc(call.data["end"])
 
+    start_time = end_time - td(hours = last_hours)
+    if "start" in call.data:
+        start_time = dt_util.as_utc(call.data["start"])
+
     start_time_local = dt_util.as_local(start_time).isoformat()
     end_time_local = dt_util.as_local(end_time).isoformat()
     timespan = { "start": start_time_local, "end": end_time_local }
diff --git a/custom_components/history_services/const.py b/custom_components/history_services/const.py
index 6431e52..395a444 100644
--- a/custom_components/history_services/const.py
+++ b/custom_components/history_services/const.py
@@ -11,6 +11,7 @@
 
 SERVICE_SCHEMA = vol.Schema({
     vol.Required("entity_id"): cv.entity_id,
+    vol.Required("last_hours"): int,
     vol.Optional("start"): cv.datetime,
     vol.Optional("end"): cv.datetime,
 })
diff --git a/custom_components/history_services/manifest.json b/custom_components/history_services/manifest.json
index b676cd3..39c6b16 100644
--- a/custom_components/history_services/manifest.json
+++ b/custom_components/history_services/manifest.json
@@ -7,5 +7,5 @@
     "iot_class": "local_polling",
     "issue_tracker": "https://github.com/davidrapan/ha-history/issues",
     "requirements": ["simplekml"],
-    "version": "0.1.1"
+    "version": "0.1.2"
 }
diff --git a/custom_components/history_services/services.yaml b/custom_components/history_services/services.yaml
index 225f3e1..4965bdb 100644
--- a/custom_components/history_services/services.yaml
+++ b/custom_components/history_services/services.yaml
@@ -8,6 +8,15 @@ export:
       required: true
       selector:
         entity:
+    last_hours:
+      name: Hours
+      description: "Data from last X hours"
+      required: true
+      default: 24
+      selector:
+        number:
+          min: 1
+          max: 120
     start:
       name: Start
       description: "Beginning of the interval"
@@ -31,6 +40,15 @@ export_device_tracker:
       selector:
         entity:
           domain: device_tracker
+    last_hours:
+      name: Hours
+      description: "Data from last X hours"
+      required: true
+      default: 24
+      selector:
+        number:
+          min: 1
+          max: 120
     start:
       name: Start
       description: "Beginning of the interval"