Minefields and sizes if Mark 8 Torpedoes are used:
*if a new minefield is layed
The biggest minefield one will ever see, will have a radius of 146 lightyears.
When laying a maximum size minefield that no one sweeps, the decay of five percent will destroy 1125 mines, which is the equivalent of 14 mk7 torpedoes or the sweeping power of 3 heavy phasers (webs: 4).
One Mk8 torpedo will be converted into 100 space mines.