When you use Portal Entre, you have 60 seconds to use Portal Exeunt before your entry portal disappears. During this time, the icon for Portal Exeunt is visible, but there is unfortunately no timer or visible countdown to help you keep track of your 60 seconds, as the skill isn’t on cooldown until you cast Portal Exeunt.
Often you may be trying to get as far as you can, and as the in-game clock (and most computer clocks) also don’t display seconds, it makes it guesswork trying to use Portal Exeunt in time.
It would be fantastic if these skills had some kind of visual timer or countdown on the skill icon for the 60 seconds that Portal Entre is activated and Portal Exeunt is usable. Even a buff icon that showed Portal Entre was active and the duration left would be an improvement.