Session Timeout Analyzer
A session timeout analyzer recommends how long a session should stay valid based on how sensitive the application is. A banking app and a social network sit at opposite ends: one re-authenticates in minutes to limit hijacking on an unattended device, the other keeps you logged in for weeks because friction costs more than the risk.
Last reviewed by the Radiatus Cloud team
Need this done properly for your business?
Radiatus delivers secure cloud, DevOps & compliance engineering.
The trade-off it models
Session timeout balances two risks. A long session is convenient but widens the window in which a stolen token, an unattended laptop or a shared computer lets someone else act as the user. A short session is safer but re-authenticating constantly frustrates users and pushes them toward weaker habits like writing down passwords. The right point depends entirely on what an attacker gains from a hijacked session.
Recommendations by type
| Application | Idle timeout | Why |
|---|---|---|
| Banking, finance, health records | 5 to 10 minutes | High-value data; unattended-device risk dominates |
| Admin panel | ~15 minutes | High-impact actions need operator presence |
| Corporate intranet | 30 to 60 minutes | Productivity balance for signed-in staff |
| Social, news, low-risk | Days to weeks (persistent) | Account-takeover impact is lower than friction |
Idle versus absolute timeout
Two limits work together. The idle timeout ends a session after a period of no activity; the absolute timeout ends it a fixed time after login regardless of activity, so a session cannot live forever by staying busy. Sensitive applications set both. On top of that, NIST 800-63B recommends re-authentication for individual sensitive actions, changing a password, moving money, regardless of how fresh the session is.
How to apply it
Use the recommendation as a starting policy, then adjust for your users and threat model. A finance tool used all day from a locked office can lean longer than the table suggests; a consumer health app on shared phones should lean shorter. Pair a sensible timeout with re-authentication on sensitive actions and secure session cookies, which the session fixation tester checks.
Related tools
- Session Fixation Tester — Paste the session ID before and after login, plus the Set-Cookie header, to check for session fixation, weak entropy and missing Secure, HttpOnly and SameSite flags.
- Cookie Security Analyzer — A new tool extracted from the codebase.
- Password Policy Strength Sim — Analyze password policy text for entropy and compliance.
- JWT Risk Analyzer — Paste a JWT to decode its header and payload and flag security risks: alg none, jku/x5u header injection, missing expiry, millisecond timestamps and personal data in claims.
Frequently Asked Questions
What timeout should a banking app use?
A short idle timeout of roughly 5 to 10 minutes, because the main risk is someone using an unattended, still-logged-in device. High-value applications also set an absolute timeout and re-authenticate for sensitive actions.
What is the difference between idle and absolute timeout?
Idle timeout ends a session after a period of inactivity. Absolute timeout ends it a fixed time after login no matter how active the user is, so a session cannot be kept alive indefinitely. Sensitive apps use both.
Does a long session mean the app is insecure?
Not necessarily. For low-risk consumer apps, a persistent session is a reasonable trade because the cost of frequent logins outweighs the takeover impact. The right length depends on what a hijacked session lets an attacker do.
What does NIST 800-63B say about session timeouts?
It recommends re-authentication for sensitive operations regardless of session age, and it favours reauthentication and session limits proportional to the assurance level rather than a single fixed number for all systems.
Is the recommendation a hard rule?
No. It is a starting point by application sensitivity. Adjust for your users and environment, then combine it with re-authentication on sensitive actions and secure, HttpOnly, SameSite session cookies.
Privacy & Security
Processed locally.
About This Tool
This tool runs entirely in your browser. No data is sent to any server, ensuring complete privacy. Simply use the interface above to get started — no registration or login required.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
Related Tools
Session Fixation Tester
SecurityPaste the session ID before and after login, plus the Set-Cookie header, to check for session fixation, weak entropy and missing Secure, HttpOnly and SameSite flags.
Cookie Security Analyzer
SecurityA new tool extracted from the codebase.
Password Policy Strength Sim
SecurityAnalyze password policy text for entropy and compliance.