How early to line up for the 5090?

According to Micro Center's website, they will be distributing vouchers to people based on their place in line: https://www.microcenter.com/site/brands/nvidia-geforce-rtx5000_series.aspx

What should I do to improve my chances of getting a card?

To increase your chances of getting a card, we suggest arriving early at your local Micro Center store on launch day. Based on past launches, lines may form before store opening.

What does the line typically look like on launch day, how did it look for the 4090? Will there be people lined up 24 hours in advance? How about the previous night? Looking for anyone's experience with the 4090 launch or anything similar, especially at the Tustin location. Thanks!