Basically... That's entirely strain and phenotype dependent. Sativa's tend to actively grow more during flowering, where as Indica's tend to have a growth spurt at the start of flowering then stop actively growing and bulk up.
Sativa bud is more leafy, looser and lighter, often producing long skinny buds along the stems, where as Indica bud is more dense, heavy and has a high flower to leaf ratio and it's quite common for the entire plant to look like one big bud when growing single cola plants.

As for how long it will take; I'm not sure what you mean? How long it takes to flower depends on the strain, the phenotype of that strain, how much stress the plant is exposed to and how 'perfect' the growing environment is.

Cheers.

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GreenX ~ Glossary of Terms:
http://www.rollitup.org/general-mari...ary-terms.html

im growing white widow now in a small space wit a few clfs have ye any tips 4 mr

eat a seed and by the time you shit it out it will be germinated

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Growmans Outdoor Grow 09