They did not in fact have a lot of time.
When they reached the fortress Alison, already dressed in her festive clothes, informed them that they had twenty minutes to prepare for the feast, which would take place in the main hall of the fortress – a place they didn't even know existed, but the capitan assured them they would have no problem finding it.
That last part was debatable.
After saying a quick thanks to Alison they almost ran to their room to get ready.
The biggest issue with the time limit was the size of the fortress – while it wasn't as big as the Order's castle, it was much much older and built as a the first line of defence of an independent city. The corridors here weren't stupid for shits and giggles, they were intentionally built to be confusing.
"You two will probably be ready before us, so don't run away." Isara warned Calen and Cassian. "We have a better chance of finding the main hall together."
