How many standard drinks can you have and then drive?

This one has always confused me. So I know the whole method that men can have 2 standard drinks in the first hour and then 1 every hour after that, and women can have 1 every hour, but there’s a few different ways that could work. For example:

I’m a male, so I’m going off the 2 standard drinks in the first hour, and then 1 every hour after method.

If I rock up at a venue at 6pm and have my 2 standard drinks between 6pm – 7pm, do I then wait until 8pm to order my next one? And if so, do I wait an hour after my final sip or can I get another one at 9pm? Then another one at 10pm etc.

OR

Do I get my 2 standard drinks between 6pm – 7pm. Then order another one between 7pm – 8pm another one between 8pm – 9pm, so I’m basically getting one on the hour disregarding the first initial hour where I can have 2, if that makes sense?

I hope I’ve worded this right. It might seem dumb but my friend has been done DUI and I play in a band where there’s always the chance to have a drink and I just wanted to make sure I’m doing the right thing! Cheers 🙂