Document Time Tracker
This would be a feature to see the dates / time spent on a document. It could be accessed in the documents info panel (attached). This feature would be useful for client invoicing and project managing especially in advertising where time is money.
Aurelian Tudorache commented
Check this out: https://exchange.adobe.com/creativecloud.details.106833.html
Just had the same idea. This would be super useful.