Did you get the this Samla bin -
https://www.ikea.com/us/en/catalog/products/S69903214/ - as the measurements 22x30 are the top measurements - therefore the overall floorspace isn’t 660sq in but from measurement my girl’s playbin from the height of substrate the bin would be 18 x27 as the bin tapers which means the floorspace is in fact only 486sq in.
I wouldn’t say this box is big but it’s a fairly decent size to start off with - as some hamster do prefer slightly smaller cage and upgrades can be made according it individual needs.