Your question is ambiguous. If you meant the Android instance max size, it is 4GB. If you meant the network connection capacity, I get good performance with a 25Mbps connection; you probably could get by with less. If you meant the memory on your desktop or laptop, I would think you could run a single modest instance on a 4GB machine. I have 13 defined instances and run up to 3 at the same time on a 12GB RAM HP laptop with an AMD A6-7310 APU. File storage is another matter. I use, including space for a couple backups, around 200GB of disk space.