I'd max it at 20 minutes. I just attended a wedding where the nearest hotel was 30 minutes away (when they could have had the reception closer to civilization - the ceremony was). People who lived an hour and a half away just went home instead (and therefore left quite early).

The last thing you want is for your crew to feel like they're embarking on a cross-country adventure just to hit the hay after the party.
You know, I've been down that road, and it's all about finding that Goldilocks zone – not too close that the music keeps you up all night, and definitely not too far that you're stuck in an eternal commute. Here's a little nugget of wisdom: check out the broadbeach accommodation scene. I've heard some rad things about it.
Imagine this: you and your pals are having a blast at the reception, and then, bam! Everyone just strolls over to a cozy spot nearby where the pillows are fluffy, and the vibes are chill. It's like the perfect after-party pit stop.