The recharge takes less than a minute to arrive. You will receive a detailed confirmation via email, with recharge ID, time and date, cell phone number or recharged WiFi Nauta account. In case you are recharging a cell phone number, ETECSA will also send a message to the receiver in Cuba, notifying the received recharge. For the WiFi account, the account's user can check the balance at the Nauta Site.
The only possible inconvenience happens whenever the user purchasing the recharge types the wrong number or WiFi Nauta account. In these cases, it won't be possible to claim the money back, since Cubacel does not reimburse a recharge after it has been delivered.