I have an awesome cream cheese and blueberry pound cake recipe that I love to bake. Can it be left on the counter and for how long?
If you have a true pound cake, it should be good at room temperature for 2-3 days, well wrapped.
The title of your question made it sound like you have a cheese cake, perhaps with a pound cake base. If that is the case:
Cheesecake is essentially a custard of cream cheese, eggs, and dairy.
None of these foods should normally be left at room temperature for an extended period of time, as they are all quite perishable.
I would recommend leaving a cheesecake out for no more than 2 hours or so, the same as any other perishable food.
Pound cake is good for a day or two on the counter, a week or so in the fridge, and indefinitely in the freezer...they freeze really well due to their high density. The addition of cream cheese doesn't make a notable difference in texture, though if you're using a frosting that will change things.
I tend to make mine in job lots, and freeze them...Stick 'em in a freezer bag, press out the air, and you're good to go. Best to eat it inside a couple of months, or it'll dry out a bit.