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I have not seen a property that contains modeling time. If there is, this could most likely be achieved by a macro that loops thru the parts and compares the property.
But if there is not a property. There is a few things that might be tricky, if there is not a property and you aim to create it.
The features contain time stamps, created and modified. But there is no way of telling the active modeling time for a part or assembly.
As a comparison between oldest and newest time-stamp would most likely be very false, since days can have passed between the modelling. To add to this, what if parts is copied from project to project and the a few old time stamps remain...?
The second thing I would like to comment is the approach of estimation, perhaps it suits the need of your company but in general I do not belive this is a good way of estimate the modeling time for a top-level assembly. Sometimes you spend days to model a cast blank that is later put into a assembly (as machined...) which you can finish within a few hours if you reuse a previous assembly.
I am an API newbie. Thank you so much for the answer and comment..