If an advanced ancient civilization you study had continued without collapsing, how long would it have taken to reach something like modernity?

by [deleted]
tripleg

Is the assumption here that "modernity" is a pre-definite and/or desirable outcome?

Searocksandtrees

Hi OP! I've removed this post since it asks respondents to speculate, which is against rules of this subreddit. Do consider x-posting to the creative minds over in /r/HistoricalWhatIf