You are always advised to logout when leaving your once logged in account. DrNirmalaShanker.com gives great value to each individual account and likes to keep it secure.

  For the security purposes, when you are logged in, no one else can login using the same account. When you are logged in, an automated tracker keeps track of your login at the server. When you logoff, the tracker releases your resources from the server. If you donot logoff properly, those resources will be released only after a long interval (mostly 2hrs) and you will not be able to login again within this period.