First--be about 7 months or so pregnant.
Second--drink a whole bunch of water or iced tea before you go. If you're extra daring, bring two small kids who have refused to go potty beforehand. :o)
That's it! That's The Secret! I only went to the aisles where I knew I needed things and just a couple more when I couldn't find something. I only bought about 5 things, nothing that we didn't need, and we were out of there in less than 30 minutes.
A personal best!