If you can't grow it, don't. It's not a personal thing against you or anyone, but if it's not full and manly by three months then it probably won't be. I tend to go without shaving for periods of time, and while it does wonders for my laziness it looks quite bad.
I just keep my goatee now, haven't really measured it but it's a good six inches now. It's all I can really grow.
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