How many days a week should I do weights/cardio?

I would suggest you read the "so you want a nice stomach" sticky.

"Weights" could mean anything. What routine are you following? What recovery/progression/set/reps/exercises does it contain?

Fat loss is a function of diet. Optimal fat loss is diet couple with a sensible progressive resistance routine.

Pairing an effective lifting routine with insanity will likely burn you out quickly (unless you have already built a great work capacity). Insanity contains lots of plyos and intervals which tend to hit CNS recovery. As the weeks go by you'll dig yourself into a bigger and bigger hole and start to feel like crap...

Finally, there's a lot of debate about it, but you're unlikely to build muscle and lose fat simultaneously (unless you fall into a specific sub-set of trainees). What you describe as toning is a function of retaining your existing muscle mass and losing fat. You may look like your more muscular, but that's because you're more defined not because you've added significant mass...