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Adjusted properly with just enough preload I can get just over six months out of SLX ones. Replacing them isn't too much of a pain, though.
Shimano tend to last me a year.
Raceface tend to last me minutes.
I've found bearing life on various press fit BB's to be comparable to Raceface's best offerings. I.e. sh*t.
While I know that Shimano HT2 BBs aren't the most reliable in the world, I understand why and appreciate the physics behind them and the design constrictions placed upon them.
Press-fit BBs however just have me shivering horribly remembering the BMX BBs of old.
My 29er rigid things is 9 months old, now on 3rd HTII BB. Done around 1500km off road.
BB shell has a hole so no water, fitted and pre-loaded as per instructions. They just end up seizing solid once the grease has washed out, then last a couple of months after that before the friction increases and they need binned.