If leaving car for a month, should I have the engine started after two weeks?

I am out of town for a month, with my car in a garage. I asked if a friend would start the car, to keep the battery juiced up, but she said she thought it would just be a drain on the battery, and better to let it sit. I don’t know if I can ask to have her let it run, but if that would make a difference, she probably would do that. Or should I just leave the car alone?

It’s a relatively new battery—about a year old.