I wish I knew what you were talking about. Looking at your history here, it seems you might have an Arduino build. If you’re using emonLib and measuring only current, then you want a whole number (or as near as possible) mains cycles in your current sample. You need to know your sampling rate. If it’s running at the same speed as our emonTx does, then the numbers are here: Sampling rate of emonLib
You should check, because that only applies to you if it’s an Arduino Uno running at the same speed as the emonTx. If not, you need to time it yourself - the best way is to time a relatively small number of samples, then time (say) 2000 more, and look at the difference in the times.
When you get to measuring the voltage as well, that’s irrelevant because emonLib can count mains cycles, so you set the number of cycles, not the number of samples.
But there’s nothing to stop you having a multi-turn primary winding - provided there’s enough slack in the wire you’re putting the c.t. on. If you just put the c.t. on a wire, that wire is a single-turn primary winding. If you loop the wire back on itself outside the c.t. and pass it through again in the same direction, that’s a 2-turn primary winding. And so on.
You can’t set the power factor, you adjust the PhaseCal value so that the power factor comes out close to 1.0.