just pulled a couple of S3s out of the garage to test them lol - what sort of share size should i be looing at getting to solve a block... its been a while since i mined anything - had a few S1s running pencil mods a few years back on here!
You need a share that is higher than the current difficulty. So the current diff is 19.28 trillion so you need a share that is that or higher for a solve
Check out solochance.com and put in your current speed for an estimate of how long it may take to solve a block.