thanks all for your replies, definitely a great community !
what i understood, if my T9 is not running 24x7, i would have very few chance to be successful using the PPLNS : (
have 3 days running but unfortunately interment, so, it looks like that is no good!
thanks
You need them to run 24/7 to get the "best bang" for your buck. Otherwise, it's costing you more money by just sitting there not getting anything in a return.
My understanding is that
PPLNS is the best especially if you're running miners intermittently since other pools' ramps are so short that soon after you stop mining there, you basically get nothing.
Here, on the other hand, it takes just as long to ramp down as it does to ramp up--assuming pool hashrate and the Network Difficulty stays the same.
Stick around. It's worth it!

Correct, but they're running it less than 50% of the time, it's really not in his best interest. Gotta set aside time to get these puppies ramped up, then the hit or miss running time will be more "justly" rewarded.