According to this thread "there is no restriction on the size of your workflow. However, you may start to see issues after 500k or 100 actions."
Hi Ken,
is correct. In the most technical of terms, there is no "restriction" on workflow size but I can tell you from experience that if you go over .5Mb you will have problems. This is not a Nintex limitation but a SharePoint limitation. The errors will be intermittent and occur on random actions throughout the workflow making it frustratingly difficult to troubleshoot unless you know you are dealing with a size issue.
For additional information on Nintex, SharePoint and Workflow limitations, check out this link: https://community.nintex.com/docs/DOC-1513
Patrick,
Would this apply to the SP 2013/16 release as well?
Yes, as far as I know, Microsoft has not made any changes to deal with this limitation so you will need to either split your larger workflows or work on simplifying your processes.
By the way, if you question is answered, please mark Roger's as correct as I only elaborated on his remarks.
Thanks!
Thanks you both for your responses!