The Quick Base Community will be read-only from August 19th-23rd while we finalize the updates to launch our new community site. On August 23rd the new community site will be live and accessible right here at this same URL with the full launch on August 27th with a special AMA with Jay Jamison on our exciting Cloudpipes news.
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I would create a formula duration field for Days Left and the formula would be [Go Live Date]-[Start Date]. You can have a choice of the units but leaving it at the default "Smart Units" is probably the best. Hope that helps.