Default expiry date for Estimates

Hi there,

Currently our estimates are set up so that we can manually put in an expiry date when generating them. My question is how can I set up the estimates so that it manually defaults to 1 month (or 30 days) from when it is generated (currently the default is no date at all). I was having a dig around archetypes and got a bit nervous changing anything without advice.

Thanks very much

Sarah

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