HosPortal will automatically log out your account if the account is idle for longer than a specified time.
By default this time is 2 hours, but you can make it as long as 30 days - that is, as long as you use the application within 30 days of the last time you used it, you will stay logged in.
The logout time is set on your account page, found by choosing "account settings" under your name at the top right:
The choose preferences from the left hand menu:
Click edit to change the login time