flowering

is there a point where the buds stop growing or speed up the increase in size. my silver haze plants are 4 weeks into a nine week flowering cycle and im worried they are going to be very small buds. they are all about the size of a paintball maybe a little bigger at the coalas. am i just being impatient. all the hairs are still white and im just starting to see thc crystals now.
 

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