Yes with two subs you can listen to them back to back (1 loop each) three days a week. I wouldn’t recommend experimenting until you become more accustomed to these subs. However the following can be used for newer people.
2 or 1 listening days a week, as well as only listening to only 3-7 mins of a sub. Other users including myself have gotten great results doing much less exposure time, even more experienced members of the forum. This is something I would recommend for newer users of it becomes too much to handle. Less is more is a genuine motto here.
As for the difference between ZPv1 and v2. I know it has something to do with what’s called the “Primer” which is in every ZP product. ZPv2 having less of it, which has led to better results. Someone more experienced can elaborate much more than I can but that is all the deets I know about it.