Well, I leaned the top nearly 6 hours and richened the bottom about 2 hours. It rips hard and I could probably lean the top another hour as my temps were barely hitting 185 - 190.

As far as the O'donnel plug question, I have not used them. I use the OS P4. No problems with them & they easily last me 2 gallons plus. Also I read on this board if you use OS then you need to stick with them as the thread pattern is slightly different and another brand may not seal completely after using the OS brand.