OK, so I've run lease-gui.exe once, provided key and closed. That's enough, right? I don't have to keep app running, right?
For me,
1) run lease-gui.exe
2) Key in private key and amount to lease
3) Once it say the lease successful, you can close the app.
4) Check your waves wallet for the lease transaction. If its there, that means all is good.
Cheers.