Interesting stuff. I guess Castro had to pick "less than 10 minutes" on this poll...There are varying reasons going around as to why Castro and his bunch were bearded, but one real reason according to him was that you could regain serious time by not shaving.
“If you save 15 minutes a day by not shaving your beard, you gain about 10 days a year that you can devote to work, to reading, to sport, to whatever you like. And you save on razors, soap and hot water, too”
He also cited the conditions when he was operating in hiding and there was no easy access to razors, blades, or other related products.
Going bearded, which was not a common practice in Cuba in the late 1950s, also served a purpose of anti-infiltration. Any government agents trying to slip into his organization would first have to grow a beard unnoticeably.
After the revolution, he and his cadres continued beardedness as symbolic of their militant days.