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At Party I usually just do the default 25 BB, and rebuy in the rare event that I get down to 12 BB .

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This is a good point for newcomers: at sites that don't allow unlimited raising HU, 12 BB should be your absolute floor, because it's the amount of money you need to avoid ever being all in on a particular hand. It happens to posters here infrequently, but still too often. For me, it also serves as a useful level to double check table conditions and my play.