---
title: What is the difference between idle timeout and maximum session lifetime?
description: "These two limits work together but serve different purposes: | Limit | What it measures | Typical reason you are logged out | | --- | --- | --- | | Idle timeout | Time since your last meaningful activity…"
url: "https://www.smsgatewaycenter.com/blog/kb/what-is-the-difference-between-idle-timeout-and-maximum-session-lifetime/"
updated: "2026-06-11"
category: Security / Session Management
---

# What is the difference between idle timeout and maximum session lifetime?

These two limits work together but serve different purposes:

| Limit | What it measures | Typical reason you are logged out |
| --- | --- | --- |
| Idle timeout | Time since your last meaningful activity in the panel | You stepped away, closed your laptop, or left a tab open without using the dashboard |
| Maximum lifetime | Total time since you first logged in | You have been signed in for many hours in one continuous session |

Idle timeout reduces risk from unattended browsers.
Maximum lifetime limits how long a single login can remain valid, even during active use - an important control for security audits and VAPT (Vulnerability Assessment and Penetration Testing) compliance.

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**Related articles**:

[Why Does SMS Gateway Center Automatically Log Me Out?](https://www.smsgatewaycenter.com/blog/kb/why-does-sms-gateway-center-automatically-log-me-out/)

[Why is automatic logout required?](https://www.smsgatewaycenter.com/blog/kb/why-is-automatic-logout-required/)

[What counts as activity that keeps my session alive?](https://www.smsgatewaycenter.com/blog/kb/what-counts-as-activity-that-keeps-my-session-alive/)

[What happens when my session expires?](https://www.smsgatewaycenter.com/blog/kb/what-happens-when-my-session-expires/)

[I was actively working – why was I still logged out?](https://www.smsgatewaycenter.com/blog/kb/i-was-actively-working-why-was-i-still-logged-out/)

### More Related Articles

- [Best practices to avoid unexpected logouts](https://www.smsgatewaycenter.com/blog/kb/best-practices-to-avoid-unexpected-logouts/)
- [Can session timeout be disabled or set per user?](https://www.smsgatewaycenter.com/blog/kb/can-session-timeout-be-disabled-or-set-per-user/)
- [I was actively working – why was I still logged out?](https://www.smsgatewaycenter.com/blog/kb/i-was-actively-working-why-was-i-still-logged-out/)

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