My diehard platinums last on average about 5 years and since I run an alternator charge it with a 1/2 amp charger over night usually every 2-3 weeks.

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time