Rockeye
Turnover is just a fancy word for play through requirements. Nothing to be concerned about. I got a few bucks on pacific and have played NL2 and NL6. It is so slow, takes about 2 hours to play a single hand. Exaggeration of course. Never played on NL25 so I don't know how it is there. But on every limit there are very few tables to choose from. Maybe 5 tables on each limit, maybe more. Pacific isn't one of the better options that pokerstrategy offers.
To answer your question. You may need to play more then 4 NL25 tables to clear the bonus.
Important: You only collect fpp's when you contribute to the rake. Being dealt cards doesn't matter.
Hope this helps.
matt.