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What resources are you using as a guide to making your mirror?
You should have considerable polish after two to three hours enough to test the surface using either the Foucault or Ronchi Test. The edge may still be translucent after this time but the remaining three to four hours will correct this and also give you a change to correct any surface defects by altering the stroke depending on what correction you need.
Note a pitch that is too soft will likely cause a severe turned down edge and central depression. The correct pitch hardness is critical and it differs summer to winter.
What grits did you use and for how long each? It could be that you have not completely removed some of the larger grit pits during a grinding stage.
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