According to ukhairdressers.com, the average beard grows 14 cm in a year; and in an average lifespan, a clean-shaven man will trim off nearly 3.5 kg of whisker hair.
Today I came across this video which documents, 'every waking hour over the course of 7 weeks', one man's evolution from clean-shaven to having a full beard.
Evolution of a Beard by YouTube user RedEyeChicago
How fast does YOUR facial hair grow? Does it grow in full and thick, or is it sparse and fine?