They don't extend these events, unless the game had an issue on their end.

The event went smooth this time.

So Yeah, They are not extending anything.

All your effort spending diamonds & energy was for nothing.

You should have calculated to see if you could get Umbral before the time limit ends.

You should have not played the event if you're free player because the event is not for free players.

That's what playerj is telling you. And yes RSL would not permit free player to have more time because they wouldn't be frustrated and there would be less chance they start paying.