diff --git a/README.md b/README.md
index b0e43d2..a6b4764 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@ This OBS Studio Lua script writes your current stream uptime to a text file, wit
 4. Click the `+` button and select `obs_uptime_to_file.lua`.
 5. Set the `Output File Path` to where you want the uptime to be written.
 6. (Optional) Set the `Format String` to customize how the uptime appears.
+7. (Optional) Set the `Update Interval (seconds)` to control how often the file is updated (default: 1 second).
 
 ## Format String
 You can control how the uptime is displayed using the `Format String` property. Use these placeholders:
@@ -32,7 +33,7 @@ You can control how the uptime is displayed using the `Format String` property.
  - `{M} minutes` → `83 minutes`
 
 ## How It Works
-- When you start streaming, the script begins writing the uptime to your chosen file every second.
+- When you start streaming, the script begins writing the uptime to your chosen file at the interval you set (default: every second).
 - When you stop streaming, the file is erased (emptied), so nothing will display if you use it as a text source.
 
 ## Use Case
diff --git a/obs_uptime_to_file.lua b/obs_uptime_to_file.lua
index a773ff3..a3437ab 100644
--- a/obs_uptime_to_file.lua
+++ b/obs_uptime_to_file.lua
@@ -6,7 +6,8 @@ source_name   = ""
 
 output_path   = ""
 format_string = "{h}:{m}:{s}"
-interval      = 1000 -- ms
+interval_sec  = 1 -- seconds
+interval      = 1000 -- ms (default, will be set in script_update)
 start_time    = nil
 hotkey_id     = obs.OBS_INVALID_HOTKEY_ID
 
@@ -20,6 +21,8 @@ function script_properties()
     obs.obs_properties_add_text(props, "format_string", "Format String", obs.OBS_TEXT_DEFAULT)
     obs.obs_property_set_long_description(obs.obs_properties_get(props, "format_string"),
         "Use {h} for hours, {m} for minutes, {s} for seconds. Example: {h}:{m}:{s}, {h}h {m}m, {m} minutes, etc.")
+    local interval_prop = obs.obs_properties_add_int(props, "interval_sec", "Update Interval (seconds)", 1, 60, 1)
+    obs.obs_property_set_long_description(interval_prop, "How often to update the file, in seconds (default: 1)")
     return props
 end
 
@@ -31,6 +34,9 @@ function script_update(settings)
     else
         format_string = "{h}:{m}:{s}"
     end
+    interval_sec = obs.obs_data_get_int(settings, "interval_sec")
+    if interval_sec < 1 then interval_sec = 1 end
+    interval = interval_sec * 1000
 end
 
 function on_event(event)
@@ -42,6 +48,11 @@ function on_event(event)
         erase_uptime_file()
         start_time = nil
     end
+    -- If timer is running, update interval
+    obs.timer_remove(update_uptime)
+    if start_time then
+        obs.timer_add(update_uptime, interval)
+    end
 end
 
 function update_uptime()