The recharge time is going to be a key factor I think. That will limit the range. Unless it isn't rechargeable and it's just a one done.
It could be that it will just fly as far as it can in one direction until it has to land.
Really looking forward to today, but I'm really interested in how the little copter is going to do. Completely new technology for Mars and it has to overcome a lot of challenges if it is going to work.