How Long Do Glow Plugs Last For?

Thanks again to all for your help and advice.

I charged the battery for approx. 6 hours yesterday afternoon/eve. Reading after was 12.6v. Tested it today before van was used and it was 12.2v. So looks like it's not holding it's charge. Couldn't test with starter cranking as I didn't have anyone to help. Will try this tomorrow.
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