"Long" means can be used for a couple of days without needing a charge, or in standby for weeks. As an example of "too fragile", I had a 7th gen. iPod with touch screen that broke after a month or two of the same treatment my 5th gen. handled for years. I went back to my 5th gen. after that.
I only need it for podcasts. I like dedicated hardware to reduce the temptation to connect to the world.
Since Apple decided to split up iTunes into different apps (I haven't upgraded my Mac yet, to keep iTunes), I'm also fine with switching to a new app to manage podcasts.
Any suggestions?