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Somewhere between that and the halflife of the proton;
http://hyperphysics.phy-astr.gsu.edu/hbase/Particles/proton.html
Somewhere between that and the halflife of the proton;
http://hyperphysics.phy-astr.gsu.edu/hbase/Particles/proton.html
From that I take it you mean slow, as in the formation of stalagmites slow?