The "Remember me" button does not remember the login credentials, it prolongs the TT2 session.

Without the "Remember me", the session should last 12 h, and if within that time you manage to use TT2, it gets prolonged again for 12 h, etc.
And if "Remember me" is ticked, then these 12 h become 183 days (but do not tell this to the client, only that it prolongs the TT2 session).

In both cases, the session might get interrupted by an authentication service restart though.

GUI-36179

FMS Login page

SSO UAA SOLUTION - Remember me

Remember password in IOS solution