How many characters are required in the username and password? Both the username and password must have at least 8 characters. There is no upper limit. The password is case sensitive. Related ArticlesWill I be reminded before my registration expires? August 25, 2015 I have forgotten my ACS username/password. What should I do? August 25, 2015 I tried to login with my ACS details but it says my account is not activated. What should I do? August 25, 2015 How long does the offsite registration to CHC resources last for? August 25, 2015 How do I register for a CHC ACS account? August 25, 2015