While minting today, it probably took 5 minutes or slightly longer to top up my OST & mint my gas.
I would suggest for future versions - to add an estimated time wait, either a progress bar so you can see how long is remaining or add a countdown timer.
That way you don't have to wonder how long it will take as it is currently.
I'd rather see a countdown timer, even if it will take 30 minutes to mint my new BT, rather than just wait not knowing how long something will take.
Makes the experience more pleasant.