Interestingly enough, the book All About Particles book mentions 何~も (e.g. 何度も to mean "any number of times") but it does not mention 何~か at all. This leads me to think that this form Rosetta Stone is using is rare or just plain wrong. Has anyone seen it before?
If so, does it really mean "several," and is there a more common or natural way to say the same thing?