I'm surprised by all of the responses from people saying they only shut the engine down once or twice during training. I shut one down in a Seminole on almost every flight during my CMEL and MEI training. I had to shut one down, feather, secure and restart it on both my CMEL and MEI checkrides too. When I had multi students we would shut one down probably 3 out of every 4 flights. Every one of my multi-engine students said that they had to shut one down in flight on the checkride.

I wouldn't do it in bad weather or over the mountains, but even the seminole holds altitude relatively well with an engine shut down. As long as you're not in Colorado or Utah you can probably fly 50+ miles on one engine even in a seminole.