Thanks mabuzzer for pointing this out. I completely agree, no need to push off users with the reappearing banner. I've set mine to three years time! In theory there is no limit for seting the cookie expiry, although users tend to clean cookies, browsers will do it automatically if set by user or is designed to clean them when they become too old. But still, 3 years time is surely enough.
For less techies here's the place to set the longer time (correct me if i'm wrong anywhere):
1. Go to /wp-content/plugins/uk-cookie-consent/
2. Open "uk-cookie-consent.php" with your favourite code editor. On mac you can use free Wrangler app or similar, on Windows, well... Google it, I'm sure you'll find something.
3. Edit line 190 which is:
days = 30; or use the search for this string and change to any numbers of days you would like. Done. Time to get real cookies, and tea.
Enjoy, and Catapult, thanks a million for providing this plugin. I love the look it's got. It's really delicate and small, doesn't interfere with design and works great with responsive theme. You're a star!