Active Directory refresh time

I am a newbie in working with AD and I am having this strange behaviour with login scripts: I put in the profile’s user the .bat file that I want to be executed at user logon time and everything works like it should be. But if I change the login script (its name or its code) and the user do the logon again, the script that is used is the old one not the new. Is there any AD cache?Any refresh time for AD? How can I change it?