What time does your 18 year old have to be home for at night?

So my son turned 18 yesterday and seems to have come to the conclusion that he no longer has house rules to follow (same thought as his mother by all accounts) As a general enquiry what time does your 18 year old stay out till on a night? on the flip side, anyone who is nearer 18 than me. ..what time do you have to be home?
thanks

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