How long does a speed light last? (Nikon SB910)?

Does anyone know how long the life of a speed light is in general? I'm planning on buying Nikon SB910, is it good?

Thanks a lot!

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Nikon 400 mm f5 - 6.3 lens vs Sigma 500 lens?

Nikon 400 mm f5 - 6.3 lens vs Sigma 500 lens?

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Compatible lense for nikon em?

I recently purchased the Nikon EM and was just curious what type of lense should i purchase for it?
·best for portraits

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Nikon D5100 lenses that have AF? - 1

Can somebody enlist the lenses that can autofocus on nikon d5100 body because there are some lenses that have AF but the AF function does not work on d5000 series. I kw this can be lengthy to answer.

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