As a general rule for driving you should leave it at least 12 hours + 1 hour for each unit you have drunk, so it is feasible for you to be still drunk after 12 hours. I have known people to be still drunk in the morning after a session and for their hangovers start mid afternoon.
I'm not sure how to answer the first part of your post, who are you afraid of ringing who2 and why?
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