Sizing of "Features for product increment" in SAFe
In Scaled Agile, a feature should take no more than one program increment to deliver by a single Agile Release Train.
I came across a very good blog for the Right sizing of features in PI in Enterprise Agile
https://www.ivarjacobson.com/publications/blog/right-sizing-features-safe%C2%AE-program-increments
