Metroid Prime Hunters DS?

Is the save system on this game any good? How often does the game save?After every mission? How long are the missions?

There aren't specific missions. It's typical Metroid Prime style where you run around huge environments solving some puzzles and shooting things. Like the above poster said you return to your ship to save. About halfway through each environment you'll find portals you can open that will transport you back to your ship and vice versa, that way you don't have to run back and forth.