Chlamydia question

I went to the doctor and they told me I had chlamydia. I drank the powder last Friday (the 15th) around 12pm and they told me to wait 7 days (1 week) to have sex.

So did the week end on Thursday (the 22nd) around 12pm. Or Friday (the 23rd). Is it a strict 7 days to the exact hour?