Well traditionally until your NH3, NO3 and NO2 are near or at zero, but I'll be letting mine sit until either I sell it or I see life coming back, in which case I'll sell it.  I don't need to monitor the cycle because I won't be putting any more livestock in this tank. As soon as I get rid of the rock and sand, I'll empty it and sell it, the stand, the sump and whatever equipment I have left and don't need for my nano.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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