Why are ARURF Queues so long?

Every time I've queued up for ARURF, I've had to wait 5-10 minutes (sometimes even longer!). I'm still fairly new at the game, but I thought ARURF was something really popular. Wouldn't that decrease queue times? At the moment the expected value (~30s) is no where near the actual value. On the other hand, when I queue for Bots, I get a game almost instantly.
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