Yes, they’re fine for long duration wear, probably the most comfortable IEMs I’ve used in that regard, but because they seal your ear canal completely you’re probably going to need to pop the seal every now and then just as a pressure relief.
Also wear them with the cables wrapped up behind your ear in the same style that concha-shaped IEMs do, inserting them so the cable is pointing forward-ish rather than down to make the wrap around behind your ear easier, as this will eliminate cable microphonics and secure their fit in the event that the cable is snagged or tugged on.
If you don’t like the way they sound return them.
Get an HD600 for half the price and live happily ever after.