I do both engines (not at once!) once a year. Feather and restart. Good for the confidence and I like managing a bunch of levers out of synch from where they usually are periodically. The fun starts when we restart them as we do not have unfeathering accumulators and sometimes they take a few of tries. I always just make sure I am over the field at 5,000 and ready for a single engine approach. No biggie for me since we do it at a very light weight.

Kind of funny our checklist says forward of detent for the props for starter start but they do not unfeather unless they are all they way forward. The checklist should say props full forward, took me a little while to figure this out the first time.