On site which I maintain there are writers that spend a lot of time editing single posts, and autosave every minute is very painful for them. So they asked me to set it to at least 10 minutes.
I found an official way to change autosave interval, so I've put this line in wp-config (at the end of it and there is no duplicate of this constant in this file):
But it didn't help. I checked everything, browser cache, memcache, redis cache and even waited a few days.
But Wordpress still uses default 60 seconds to run autosave script. Any ideas why is this happening or how to overcome this?