Most of them last forever.
That means a minimum of 20 years, to me.
I bought a 20 year old used Hild for $25.00, used it about 20 years, sold it for $25.00 when I retired.
I have run most brands at one time or another. In my opinion, the Clarke was the smoothest running.
New, they cost about $1000, but you can do well with a used one.
Gary
Proud inventor of the Furniture Kickstand.