The "keep me signed in" checkbox, does "just" change the behavoir when the browser is closed. It does not affect after how long the user is logged out.
If the checkbox is not checked and the user closes the browser, opening it again and navigating to https://admin.bookingkit.com/ - the system will ask for a login again.
In the opposite way, when the checkbox is checked, the user will still be logged in also if they close and reopen the browser.
The rule for getting logged out:
the user clicked on log-out
after the session time is expired.
The duration of a session is 30 days.
if "remember me" is active
or closing browser (if remember me is not active,)
Changing network should not affect it