My Gillette mach 3 lasts more than a month as I only shave 2-3 times a week.
You blade can last for a year if you shave once every 3 months and store in a moisture free box.
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2017 F25 X3 -> Current
2016 F10 535 -> SOLD
2014 F30 -> SOLD
2013 F30 -> SOLD
2007 E90 -> SOLD
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