Hi @oluna777, welcome to the community 
I am afraid the session duration isn’t currently configurable (you can find the available options here, they mostly cover the email functionality at this point). You might want to leave a vote on a previous feature request for this though:
If you don’t need multiple users in n8n itself, you could also consider setting up an n8n instance without user management behind a reverse proxy server implementing forward authentication. I am using Caddy + Authentik for this which allows you to configure the session length. This would also allow using 2FA for example.