Why do rifts stay open?

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After I've beaten the Rift Guardian and grab the loot, I teleport back to town and talk to Orek to get the gold and experience. Then, there's a countdown for about 30 seconds while the rift portal stays open. I go through the portal again, but I find that I'm at the entrance of the rift, with the enemies cleared out, naturally. Then I run around a few seconds before I'm taken back to town again.
Why does the rift stay open? What am I supposed to do?
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Are Nephalem rifts endless?
It's a finite number of levels, but if you're you're looking for legendaries it's definitely worth going on, because your legendary drop rate is +100% inside rifts!How do you close a rift in Rift?
One can't close the GR as long as there is one player didn't upgrade his gem, so the slow player doesn't have to worry about GR closing when picking the loots. But yeah, the Nephalem Rift should close instant in solo game though. The reason it exist is that there isn't the Gem Leveling Vendor at the end.Get THE Best Rewards From Rifts! Simple Advise For Best Statistical Chances!
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Images: Plato Terentev, cottonbro, cottonbro, Jack Sparrow