I wouldn't say 6 months... maybe 4 weeks. Personally I do every two... but that's just me.
Starting Size (09/2009): ~7"BPEL x ~5" MSEG Most Recent Measurement (08/13/2012): 8"BPEL x 5.5"MSEG Final Goal: When I'm told to stop. http://www.towelaroundtheworld.com/#/us
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