Well, “infinite”, so far a few minutes.
If you switch from, for example, the latest page to the categories page, the categories page won’t load. You can still get the categories page by refreshing, but so it goes.
This is observable on these Meta forums, as well as my forums (plugins: lazyYT, poll). Using Chrome, Win7 64bit.
Confirmed (well, if not infinite,5+ minutes)
Latest -> Categories
No error messages that I could see with a brief look
EDIT
Happening here too using Firefox
Thanks you both @Yuun and @Mittineague for reporting that issue. Just pushed a fix 
https://github.com/discourse/discourse/commit/d71301e4064551a0776fad5a70c89e6939366634
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