To answer the question, ahem; in my increasingly distant youth they would very rarely break, maybe every couple of years, but so far apart you didn't exactly count the time. Back then, it was mostly due to, well, youth, not doing any very physical things with the hands apart from guitar, no particular gardening or repair of machinery for example! Its also down to learning to default to using the left for many things, opening car doors, gates, etc.
Nowadays I have to keep them carefully moisturised with cream and/or nail oil (you do have to rub those things in...) or they get very thin and fragile. And they are still worth the effort.
Simon Ambridge Series 40 (2005)
Trevor Semple Series 88 (1992)
Louis Panormo (1838)
Alexander Batov Baroque Guitar (2013)