Nanners do not affect quality, but it does severly cut-back on yield.

Spraying the plants during the pollination process will kill the pollen not yet pulled into the calyx. (pulled down the pistil) This might alter the actual pollination schedule you're refering to. With proper plant care, seeds take 4-5 weeks just to become viable. 5-6 weeks (or more) for fully developed seeds. Depends on the strain(s) though.

Yellow or white seeds - Inviable. (too immature to trust)
Tan seeds - A percentage of them will be viable and might be fine.
Light brown or dark brown - Fully developed.