It will come on immediately and you will feel nothing. This will last for about 4 hours.
You made 3 greasy cupcakes with those three grams right?
You don't need to cook it in a crock pot for 6 hours. That step would have killed it. The act of cooking cupcakes, brownies etc. is enough to activate bud.
Just mix bud in with whatever you're baking and bake it, then it will bake you.
I've OD'd on weed before, it was not fun. You ain't gonna have that problem with these cupcakes though.