I have done the math here many times. I will do it again. The Best any fusor has done is 3×10^11 neutrons per second. Lets say we want 239grams of Plutonium from 238grams of Uranium. (1 mole). It would take 63 thousand years to do this assuming 100% of neutrons are the captures we want.
To get meaningful breading times, your neutron source is a power source.
