should i keep it going?

hey everyone,


right now i am growing 2 feminized lowryders, snow ryder and a different strain (forget the name) the site i got them from says 60 days from seed to harvest, i think its been about 2 and a half months so far and the plants have been flowering for a while now, there is little buds and crystals but not very much bud at all, i have the plants under one 15 watt red and blue l.e.d. and one 40 watt cfl, how do i know when the best time to harvest is? i heard that if you harvest too late it will effect the quality of your marijuana, i wana keep the plants going a bit longer cause there isn't very many buds and the buds are super tiny but i don't wana harvest too late and effect the quality

PLEASE HELP!!!!!:?
 
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