alcoholism disadvantage clarification

[Jaware]

I have a pic that took the disadvantage alcoholism. I looked at the disadvantage, and it's pretty nasty.

However. It says you confine your drinking to the evening, usually.

And if you fail your will roll, binge drink for 2d hours.

I went and looked at the intoxication section in campaigns, but it doest say how long a "binge" is nor how many drinks are consumed in that time?

could someone clarify that for me please?