Help! - We are going to the Feywild!

So! I was soooo excited to introduce the concept of the Feywild to my players - as a new place on a different plane that they had to find, hinting that they needed to meet some specific fey and to gather a quest item. Here's the thing - I'm anxious because I've already given the hint that time runs differently there too. I'm worried if they take forever in there, the world they are trying to save on the other plane will be gone. How do I make it exciting and rich and wonderful while also making them gtfo (gently lol). Not to mention, I name dropped some pretty awesome characters that I was hoping they'd meet - and now I just don't think it's possible. I know it sounds silly because we are literally playing a game and I am creating the world - but I would love some advice!