I've always done corned beef in a pressure cooker. I could've sworn I only did 45 min in my stovetop cooker, but all the recipes I find are for 60-90min. Last night, I did one with 3c water, 2.5lb corned beef, 70min high pressure. natural pressure release. Put in potatoes, cabbage, onions after straining liquid and removing beef. I only strain because i hate getting bits of bay leave and coriander in my veggies. 3min high pressure, then instant release.