1. Just bought a Nano Ledger S, transferred some bitcoins, it reached the wallet, but transaction not yet confirmed, can I unplug Nano Ledger S now, or does it transaction need to be confirmed before I unplug it?

2. When is the proper time to switch off Nano Ledger S, is there something special I need to do before switching off?

3. How many bitcoins can I hold in the Nano Ledger before it gets full?