Hard to say, because there are differences from Manufacturer to Manufacturer.
I had a - heavy - Takeda Miyabi which was still strong after 8 years or regular
use (a few times per week), had a Shelter which was down after 1.5 years.
I had a - heavy - Takeda Miyabi which was still strong after 8 years or regular
use (a few times per week), had a Shelter which was down after 1.5 years.