Technical info:
Seal: 2Z (steel seal)
The seal is a thin steel plate and seal a so-called no lingering since the cover does not contact with the inner ring, so does virtually no friction, no wear and therefore widely used and generally seen as "dust cover". Furthermore, the ZZ seal is very suitable for high speeds and temperatures.
Lifetime Calculation
The forces on this bearing will probably too small for some good calculations. It's obvious to decide this bearing will to lifetime.
All force are radial.