You can set daily time on site limit on your account. Time on site limits will take effect immediately and can be made more restrictive at any time. Once a time limit has been set, you must wait 72 hours measured from 12:00 am on the day the limit was set followed by a 24-hour cool off period to make the limit less restrictive.
To set a time on site limit, visit the Responsible Gambling section of your account.