Do what you can for exercise. If you can't walk for 30 minutes, then walk for 10 minutes. Taking a 10 minute walk three times a day still adds up to a 30 minute walk. You can break your workouts up into shorter segments and still get all the health benefits.
Also, if you can't stand for long periods because of your gout, then consider chair workouts. If you go to YOUTUBE and search on chair aerobics, you'll find a number of different cardio workouts that you can do while sitting in a chair. Coach Nicole has a short chair workout you might try too. www.sparkpeople.com/resource/videos-detail