You can if you resort to plugins. VectorScribe contains the Extend Path tool which can extend linear and Bezier paths to precise lengths, or multiples.   https://astutegraphics.com/plugins/vectorscribe ... View more

No real every day use whatsoever. Occasional and experimental in the extreme. Sorry to be so blunt. All IMHO. ... View more

A small number of users have also reported this. Adobe have just released to minor stability fix updates in the past week which appears to have unsettled some systems. Whilst we can't replicate it on any setups this end, we have worked with several users to find that it's simply a case of un-installing and re-installing our plug-ins. No need to re-apply license keys, etc. We have just published this post for full guidance: Illustrator CC2017 minor updates - January 2017 - Astute Graphics We hope this is of help! ... View more