soooo Im not much on electricity so how long is that using the 12 volt power supply in a one quart jar? lol I ordered a ppm meter made for measuring this stuff...Should break down to like under a dollar a gallon to make it at home versus $20 for few oz
Thats kind of impossible to answer.. It depends on the resistance across your electrodes, and through the solution.. Remember distilled water is a POOR conductor..
If you had a multimeter you could measure values like resistance/current.. Without one, estimation via bubble counts would be the only source of info aside from EC..
Expect it to start slowly, at perhaps 1mA and speed up as silver ions increase the conductivity.. If things stayed at 1mA I'd let it go for a month or two, it might go up to 5mA, it might approach 100mA, it depends on things like electrode size, separation distance etc.. Lots of silver surface area on electrodes spaced closely will give you the most current.. It may be better to keep them further separated though as bringing them together essentially increases effective voltage, and too much voltage can cause undesirables in most electrolysis setups..
Keep us updated on the EC/ppm..