Because of leakage I change pouches every 3 days. Recently I've discovered that if I spray my skin twice with skin barrier spray before attaching the pouch with the barrier ring installed on the pouch it has not leaked.
Also my Stoma nurse at Mayo told me that you need to cut the hole in your pouch about 1/16 of an inch larger than the Stoma so the barrier ring can creep through between the Stoma and the pouch. If you do it proper you can see a white ring around the Stoma about an hour after changing